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ERC-721
Overview
Max Total Supply
975 ↵
Holders
357
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
4 ↵Loading...
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| # | Exchange | Pair | Price | 24H Volume | % Volume |
|---|
Contract Name:
Ret_rn
Compiler Version
v0.8.20+commit.a1b79de6
Optimization Enabled:
Yes with 9999999 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT
pragma solidity 0.8.20;
import {
ERC721A,
IENS,
IResolver,
IENSReverseRegistrar,
Base64,
Strings,
DataContract
} from "./dependencies.sol";
/**
* @title Ret↵rn
* @author 0age
* @notice Generative audiovisual art where all metadata is stored and rendered
* onchain. Each musical work is minted in an unrevealed state over an
* open, 3 day window from deployment. After the mint phase ends,
* entropy is sourced from both a future block and a commited preimage
* and used to finalize metadata and reveal the end state of each minted
* work. Warning: flashing imagery & audio present.
*/
contract Ret_rn is ERC721A {
using DataContract for address;
using Base64 for bytes;
using Strings for address;
using Strings for uint256;
/**
* @dev Emit an event once the reveal phase has been finalized indicating
* that token metadata has been updated.
*
* @param fromTokenId The first tokenId (0).
* @param toTokenId The last tokenId (totalSupply - 1).
*/
event BatchMetadataUpdate(uint256 fromTokenId, uint256 toTokenId);
/**
* @dev Emit an event when the reveal phase has been prepared, including
* the range of block numbers during which the reveal can be performed.
* If the reveal phase is not conducted during this window, owners of
* unrevealed tokens are able to burn their tokens to receive a refund
* of the mint price.
*
* @param firstAvailableRevealBlockNumber The first block number during
* which the reveal can be performed.
* @param lastAvailableRevealBlockNumber The last block number during which
* the reveal can be performed.
*/
event Prepare(
uint256 firstAvailableRevealBlockNumber,
uint256 lastAvailableRevealBlockNumber
);
/**
* @dev Emit an event when the reveal phase has been completed, displaying
* the finalized seed and maximum supply.
*
* @param finalizedSeed The finalized seed set during the reveal.
* @param finalizedMaximumSupply The maximum post-reveal token supply.
*/
event Reveal(bytes32 finalizedSeed, uint256 finalizedMaximumSupply);
/**
* @dev Revert with an error if attempting to mint tokens after the
* minting phase has been completed.
*/
error MintCompleted();
/**
* @dev Revert with an error if attempting to retrieve a seed for a token
* prior to completion of the reveal phase.
*/
error PreReveal();
/**
* @dev Revert with an error if attempting to prepare the reveal phase
* before the minting phase has been completed.
*/
error MintPhaseNotComplete();
/**
* @dev Revert with an error if attempting to prepare the reveal phase
* multiple times.
*/
error RevealAlreadyPrepared();
/**
* @dev Revert with an error if attempting to conduct the reveal phase
* before it has been prepared.
*/
error RevealNotPrepared();
/**
* @dev Revert with an error if attempting to conduct the reveal phase
* before the prepared block number has been reached.
*/
error RevealNotReady();
/**
* @dev Revert with an error if attempting to conduct the reveal phase
* after the block hash for the prepared block number is no longer
* accessible.
*/
error RevealExpired();
/**
* @dev Revert with an error if block entropy used during the reveal phase
* is not available.
*/
error RandomnessNotAvailable();
/**
* @dev Revert with an error if attempting to conduct the reveal phase
* multiple times.
*/
error AlreadyRevealed();
/**
* @dev Revert with an error if the commit message provided during the
* reveal phase does not match the original commit hash.
*/
error InvalidCommitMessage();
/**
* @dev Revert with an error if Ξ0.05 per minted token was not supplied.
*/
error InvalidMintValue();
/**
* @dev Revert with an error if a refund attempt during token burning fails.
*/
error BurnRefundFailed();
/**
* @dev Revert with an error if payment portion of the reveal phase fails.
*/
error FinalizationFailed();
/**
* @dev Revert with an error if `prepareReveal` or `reveal` are called by an
* account other than the author as indicated by their ENS record.
*/
error Unauthorized();
/**
* @dev Represent various attributes of a given token as a group of strings.
*/
struct Attributes {
string seed;
string tempo;
string vibe;
string root;
string style;
string arrow;
string color;
string tone;
string creator;
}
// Declare the core ENS registry contract.
IENS private constant ens = IENS(
0x00000000000C2E074eC69A0dFb2997BA6C7d2e1e
);
// Declare a commit hash that will be used to verify a respective message
// during the reveal phase before incorporating said message as a component
// of the final global seed.
bytes32 private constant commit = bytes32(
0xdf1b8bdd0db9449895571155d1e7d8ba0b5891111de4164a8ebe2760472961b5
);
// Declare an immutable variable representing the time when minting ends.
uint256 public immutable mintComplete;
// Declare an immutable variable representing the ENS node for the author.
bytes32 private immutable authorNode;
// Declare an immutable variable representing the address of a data
// contract containing metadata rendering logic.
address private immutable dataContract;
// Declare a mapping of token IDs to their respective creators. Note that
// in instances where a multiple tokens are minted at once, only the first
// token ID is recorded; when determining the creator of a token with a
// given ID where a non-zero account value is held in the mapping, the
// tokenId should be decremented until a non-zero account is located.
mapping (uint256 => address) private _creators;
// Declare a state variable representing the global seed. This value is
// set upon completion of the reveal phase and is used as a component of
// metadata generation for each token.
bytes32 public globalSeed;
// Declare a state variable representing the block number committed to
// when preparing the reveal phase. The PREVRANDAO value (if available)
// or the block hash of this block number is used as a component of the
// final global seed.
uint256 public revealEntropyBlockNumber;
/**
* @dev On contract creation, assign authorship via an ENS name hash,
* set the ENS reverse registrar name for this contract, deploy
* a new data contract containing rendering logic, and set the
* timestamp at which the initial mint phase completes.
*/
constructor() {
// Define the authorNode using the ENS name hash of "0age.eth".
authorNode = keccak256(abi.encodePacked(
keccak256(abi.encodePacked(
bytes32(0),
keccak256(abi.encodePacked("eth"))
)),
keccak256(abi.encodePacked("0age"))
));
// Derive the ENS reverse registrar node using "reverse.ens.eth".
bytes32 reverseRegistrarNode = keccak256(abi.encodePacked(
keccak256(abi.encodePacked(
keccak256(abi.encodePacked(
bytes32(0),
keccak256(abi.encodePacked("eth"))
)),
keccak256(abi.encodePacked("ens"))
)),
keccak256(abi.encodePacked("reverse"))
));
// Instantiate the ENS reverse registrar.
IENSReverseRegistrar ensReverseRegistrar = IENSReverseRegistrar(
ens.resolver(reverseRegistrarNode).addr(reverseRegistrarNode)
);
// Set the name for the ENS reverse registrar.
ensReverseRegistrar.setName(unicode"ret↩️rn.eth");
// Declare the initialization code for the data contract containing
// the rendering logic. The data is prepended with a header that places
// a single `INVALID` opcode followed by the data in runtime during
// contract creation.
bytes memory initCode = abi.encodePacked
(bytes12(0x600b5981380380925939f3fe),
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seed="0x8a0a40912f2627d9cc3f37b4933f0f15670c5220610e593685634b852482dfdd",sy=[8629,8601,8629,8604,8617,8629,8647,8656,8629,8676,8678,8629,9166,8629,9664,10550];function germinate(e){var 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// Create a new contract using the initialization code.
address addr;
assembly {
addr := create(0, add(initCode, 0x20), mload(initCode))
}
// Assign the new contract's address to the data contract.
dataContract = addr;
// Set the timestamp at which the mint phase completes.
mintComplete = block.timestamp + 3 days;
}
/**
* @dev Supply Ξ0.05 and mint a single token to the caller. Minting is
* possible until 3 days after contract deployment. Minted token will
* be in an unrevealed state until the mint completes and additional
* entropy is added. Provenance is established by permanently storing
* the address of the caller as the creator of the respective token
* and incorporating it into the seed that determines its attributes.
*/
function mint() external payable {
_create(msg.sender, 1);
}
/**
* @dev Mint an arbitrary quantity of tokens to the caller, supplying Ξ0.05
* per work minted. Minting is possible until 3 days after contract
* deployment. Minted token will be in an unrevealed state until the
* mint completes and additional randomness is added. Provenance is
* established by permanently storing the address of the caller as the
* creator of the respective token and incorporating it into the seed
* that determines its attributes.
*
* @param amount The amount of tokens to mint.
*/
function mint(uint256 amount) external payable {
_create(msg.sender, amount);
}
/**
* @dev Mint an arbitrary quantity of tokens to the a specified account,
* supplying Ξ0.05 per work minted. Minting is possible until 3 days
* after contract deployment. Minted token will be in an unrevealed
* state until the mint completes and additional randomness is added.
* Provenance is established by permanently storing the address of the
* caller as the creator of the respective token and incorporating it
* into the seed that determines its attributes.
*
* @param to The address to send the minted tokens to.
* @param amount The amount of tokens to mint.
*/
function mint(address to, uint256 amount) external payable {
_create(to, amount);
}
/**
* @dev Prepare for the reveal phase by setting a future block number that
* will be used to derive additional entropy when revealing tokens.
* This function can only be called by the author and only after the
* mint phase is complete, or 3 days after contract deployment. A
* `RevealAlreadyPrepared` error will be thrown if an attempt is made
* to prepare the reveal phase multiple times.
*
* @return firstAvailableRevealBlockNumber The first block number that the
* reveal can be performed.
* @return lastAvailableRevealBlockNumber The last block number that the
* reveal can be performed.
*/
function prepareReveal() external returns (
uint256 firstAvailableRevealBlockNumber,
uint256 lastAvailableRevealBlockNumber
) {
// Only the author can prepare the reveal phase.
_onlyAuthor();
// Ensure mint phase is complete before reveal phase can be prepared.
if (mintComplete > block.timestamp) {
revert MintPhaseNotComplete();
}
// Ensure that the reveal phase can only be prepared once.
if (revealEntropyBlockNumber != uint256(0)) {
revert RevealAlreadyPrepared();
}
// Set the block number that will be used to derive additional
// entropy during the reveal phase. Assign a block number that
// is 64 blocks in the future to protect against selecting for
// a specific block proposer.
revealEntropyBlockNumber = block.number + 0x40;
// Set block number range during which reveal can be performed.
firstAvailableRevealBlockNumber = revealEntropyBlockNumber + 1;
lastAvailableRevealBlockNumber = revealEntropyBlockNumber + 0xff;
// Emit an event to signal the preparation of the reveal phase,
// including the range of block numbers during which the reveal
// can be performed.
emit Prepare(
firstAvailableRevealBlockNumber,
lastAvailableRevealBlockNumber
);
}
/**
* @dev Reveal final attributes and metadata by setting a global seed to a
* derived from the block number assigned when preparing to reveal and
* from a message that hashes to a value committed during deployment.
* This function can only be called by the author and only after the
* reveal phase has been prepared. An "AlreadyRevealed" error will be
* thrown if an attempt is made to reveal multiple times. Triggering
* reveal on the first available block is preferable, as PREVRANDAO is
* more resistant to biasability than block hashes. Should the author
* fail to successfully finalize the reveal during this period, owners
* of unrevealed tokens are able to burn those tokens to receive a
* refund of the mint price.
*
* @param commitMessage The commit message used during the reveal.
*
* @return finalizedSeed The finalized seed used for the reveal.
*/
function reveal(
string calldata commitMessage
) external returns (bytes32 finalizedSeed) {
// Only the author can finalize the reveal phase.
address payable authorAccount = _onlyAuthor();
// Ensure that the reveal has not already been conducted.
if (globalSeed != bytes32(0)) {
revert AlreadyRevealed();
}
// Ensure supplied commit message matches original commit hash.
if (keccak256(bytes(commitMessage)) != commit) {
revert InvalidCommitMessage();
}
// Retrieve the block number committed to during the prepare phase.
uint256 randomnessBlockNumber = revealEntropyBlockNumber;
// Ensure that the reveal phase has been prepared.
if (randomnessBlockNumber == uint256(0)) {
revert RevealNotPrepared();
}
// Ensure that the reveal phase has started.
if (randomnessBlockNumber >= block.number) {
revert RevealNotReady();
}
// Ensure that the reveal phase has not ended.
if (randomnessBlockNumber + 0xff < block.number) {
revert RevealExpired();
}
// Declare a value for the randomness sourced from that block.
uint256 randomness;
// Use PREVRANDAO if available — it is only available on the
// first block after the reveal phase has started.
if (randomnessBlockNumber == block.number - 1) {
randomness = block.prevrandao;
}
// Otherwise, use the blockhash as a fallback.
if (randomness == 0) {
randomness = uint256(blockhash(randomnessBlockNumber));
}
// Sanity check to ensure a non-zero randomness was located.
if (randomness == 0) {
revert RandomnessNotAvailable();
}
// Derive finalized seed using the chain id, the contract address,
// the randomness sourced from the block, and the commit message.
finalizedSeed = keccak256(abi.encodePacked(
block.chainid,
address(this),
randomness,
commitMessage
));
// Set the global seed to the finalized seed.
globalSeed = finalizedSeed;
// Transfer any remaining contract balance to the author.
(bool ok, ) = authorAccount.call{value: address(this).balance}("");
// If the transfer fails, revert the transaction.
if (!ok) {
// Use assembly to "bubble up" return data if available and not
// excessively long.
assembly {
if and(returndatasize(), lt(returndatasize(), 0xffffff)) {
returndatacopy(0, 0, returndatasize())
revert(0, returndatasize())
}
}
// Otherwise, revert with a generic error.
revert FinalizationFailed();
}
// Determine the total supply of tokens.
uint256 maxSupply = totalSupply();
// Emit event to indicate finalization of metadata and max supply.
emit Reveal(finalizedSeed, maxSupply);
// Emit event to indicate that all metadata has been updated. Note
// that some tokens may not be included if any have been burned and
// will have to be updated manually.
emit BatchMetadataUpdate(0, maxSupply - 1);
// Return the finalized seed value.
return finalizedSeed;
}
/**
* @dev Burn a given token assuming that the caller is the owner or has been
* approved by the owner. If more than 30 minutes have passed since the
* minting phase has completed and the reveal phase has not yet been
* finalized, the owner of the token will receive a refund of the mint
* price. Note that there is a danger that a token may be burned even
* when it is not eligible for a refund; if a refund is expected, using
* `burnUnrevealedAndRefund` is recommended.
*/
function burn(uint256 id) external {
// Burn the token and perform a refund if applicable.
_destroy(id);
}
/**
* @dev Burn a given unrevealed token and ensure that a refund of the
* mint price is received by the owner, assuming that the caller is
* the owner or has been approved by the owner. This function is only
* callable if more than 30 minutes have passed since the minting phase
* has completed and the reveal phase has not yet been finalized. While
* `burn` may also be used for this purpose, there is a danger that the
* token may be burned even when it is not eligible for a refund.
*/
function burnUnrevealedAndRefund(uint256 id) external {
// Ensure that the reveal phase has not been finalized.
if (globalSeed != bytes32(0)) {
revert AlreadyRevealed();
}
// Burn the token and ensure that a refund is performed.
if (!_destroy(id)) {
revert BurnRefundFailed();
}
}
/**
* @dev Get the address of the account that minted a specified token. Note
* that this function can consume a significant amount of gas in cases
* where the creator minted many tokens at once.
*
* @param id The id of the token in question.
*
* @return creator The address of the account that minted the token.
*/
function getCreator(uint256 id) external view returns (address) {
// Ensure that a token with the given id exists.
if (!_exists(id)) {
revert URIQueryForNonexistentToken();
}
// Retrieve and return the creator of the specified token.
return _getCreator(id);
}
/**
* @dev Get the "seed" for a given id. The seed is derived from the
* token's id, the global seed, and the address of the account
* that minted the token. This function will revert unless the
* global seed has been finalized.
*
* @param id The id of the token in question.
*/
function getSeed(uint256 id) external view returns (bytes32) {
// Ensure that a token with the given id exists.
if (!_exists(id)) {
revert URIQueryForNonexistentToken();
}
// Retrieve the global seed value from storage.
bytes32 randomness = globalSeed;
// Revert if the global seed has not been finalized.
if (randomness == bytes32(0)) {
revert PreReveal();
}
// Derive and return the seed of the specified token.
return _getSeed(id, globalSeed);
}
/**
* @dev Get the SVG associated with the specified id. The default image
* will be returned unless the global seed has been finalized.
*
* @param id The id of the token in question.
*/
function image(uint256 id) external view returns (string memory) {
// Ensure that a token with the given id exists.
if (!_exists(id)) {
revert URIQueryForNonexistentToken();
}
// Return image for the token (do not supply a previously-derived seed).
return _image(id, globalSeed, bytes32(0));
}
/**
* @dev Get the address currently resolved by the ENS name hash of the
* author of this artwork.
*/
function author() public view returns (address) {
return ens.resolver(authorNode).addr(authorNode);
}
/**
* @dev Get the ERC721 metadata for the token with the specified id. The
* metadata is formatted as a dataURI containing a JSON object
* containing the name, description, and attributes of the token as
* well as a dataURI-encoded SVG image and a dataURI animation_url
* containing an html document with web audio code for playing the song
* and animation of the token. The html document itself is retrieved
* from a data contract and the token's seed is inserted into the code;
* this seed determines what audiovisual content will be rendered. The
* metadata is only finalized once the global seed has been set, and
* will otherwise return a default image and metadata.
*
* @param id The id of the token in question.
*/
function tokenURI(uint256 id) public view override returns (string memory) {
// Ensure that a token with the given id exists.
if (!_exists(id)) {
revert URIQueryForNonexistentToken();
}
// Read the global seed value from storage and use as entropy.
bytes32 entropy = globalSeed;
// Derive the seed for the given token using the id and entropy.
bytes32 seed = _getSeed(id, entropy);
// Construct and return the token metadata.
return string.concat(
'data:application/json;base64,',
bytes(
string.concat(
unicode'{"name":"Ret↵rn — #',
id.toString(),
'","description":"Generative audiovisual art where all metadata is stored and rendered onchain.","attributes":',
entropy == bytes32(0) ? '[{"trait_type":"Status","value":"Unrevealed"}]' : _format(_getAttributes(seed)),
',"image":"data:image/svg+xml;base64,' ,
bytes(_image(id, entropy, seed)).encode(),
'","animation_url":"data:text/html;base64,',
entropy == bytes32(0) ? _prerevealAnimation() : dataContract.encode(seed),
'"}'
)
).encode()
);
}
/**
* @dev Get a quasirandom dataURI containing an html document with web audio
* code for playing a generative song and animation.
*/
function explore() external view returns (string memory) {
// Construct and return metadata using entropy from the previous block.
return _explore(bytes32(block.prevrandao));
}
/**
* @dev Get a dataURI containing an html document with web audio code for
* playing a specific generative instance of an audiovisual work using
* a deterministic seed, regardless of whether a token with the given
* seed exists.
*
* @param seed The seed to use for generating the audiovisual work.
*
* @return The dataURI containing the base64-encoded html audiovisuals.
*/
function explore(bytes32 seed) external view returns (string memory) {
// Construct and return the metadata using the supplied seed.
return _explore(seed);
}
/**
* @dev Get the name of this contract.
*/
function name() public pure override returns (string memory) {
// Return the name of this contract.
return unicode"Ret↵rn";
}
/**
* @dev Get the symbol of this contract.
*/
function symbol() public pure override returns (string memory) {
// Return the symbol of this contract.
return unicode"↵";
}
/**
* @dev Deconstruct the supplied seed into its constituent attributes,
* represented as strings.
*
* @param seed The provided seed.
*
* @return tempo
* @return vibe
* @return root
* @return style
* @return arrow
* @return color
* @return tone
* @return creator The address of the account that minted the token.
*/
function germinate(bytes32 seed) public pure returns (
string memory tempo,
string memory vibe,
string memory root,
string memory style,
string memory arrow,
string memory color,
string memory tone,
string memory creator
) {
// Derive the attributes from the seed.
Attributes memory attributes = _getAttributes(seed);
// Return the attributes as distinct strings.
return (
attributes.tempo,
attributes.vibe,
attributes.root,
attributes.style,
attributes.arrow,
attributes.color,
attributes.tone,
attributes.creator
);
}
/**
* @dev Get contract-level information, formatted as a dataURI containing a
* JSON object with the contract name, author, description, and
* collection image.
*/
function contractURI() external view returns (string memory) {
return string.concat(
'data:application/json;base64,',
Base64.encode(
abi.encodePacked('{',
unicode'"name": "Ret↵rn", ',
'"author": "0age", ',
'"description": "Generative audiovisual art where all metadata is stored and rendered onchain. Each musical work is minted in an unrevealed state over an open, 3 day window from deployment. After the mint phase ends, entropy is sourced from both a future block and from a message whose contents are committed to at the time of deployment. This entropy is used to finalize metadata and reveal the end state of each minted work. Provenance is established for each token by permanently recording the account used to create it and incorporating the address into the seed that determines token attributes. Warning: flashing imagery & audio present.", ',
'"image": "data:image/svg+xml;base64,', bytes(_image(0, bytes32(0), bytes32(0))).encode(),
'"}')
)
);
}
/**
* @dev Internal function for minting a specified amount of tokens to a
* specified address. Ξ0.05 must be provided for each token minted, and
* minting is only possible during the mint phase, which lasts for 3
* days after deployment. As part of token creation, the address of the
* caller will be recorded as the creator of the tokens, and will be
* incorporated into each token's seed once reveal has been finalized.
*
* @param owner The address to mint the tokens to.
* @param amount The amount of tokens to mint.
*/
function _create(address owner, uint256 amount) internal {
// Ensure that the mint phase is still active.
if (mintComplete <= block.timestamp) {
revert MintCompleted();
}
// Ensure that the correct amount of Ξ has been provided.
if (msg.value != amount * 1 ether / 20) {
revert InvalidMintValue();
}
// Determine the next token id to be minted, used to register creator.
uint256 id = _nextTokenId();
// Mint the tokens to the specified address.
_mint(owner, amount);
// Record the creator of the tokens.
_creators[id] = msg.sender;
}
/**
* @dev Internal function for burning a token. If the mint phase has been
* over for 30 minutes and the reveal phase has not been finalized, the
* owner of the token will be refunded Ξ0.05. Otherwise, the token will
* just be burned. Note that only the owner or an approved account can
* burn a token.
*
* @param id The id of the token to burn.
*
* @return A boolean representing whether or not the owner was refunded.
*/
function _destroy(uint256 id) internal returns (bool) {
// Determine the current owner of the token.
address owner = ownerOf(id);
// Burn the token if the owner is the caller or the caller is approved.
_burn(id, true);
// Declare a boolean representing whether or not the owner was refunded.
bool refunded;
// Refund if mint has been over for 30 minutes & global seed is not set.
if (
mintComplete + 30 minutes <= block.timestamp &&
globalSeed == bytes32(0)
) {
// Send the owner Ξ0.05 (the original mint amount per token).
(bool ok, ) = owner.call{value: 1 ether / 20}("");
// If the transfer fails, revert the transaction.
if (!ok) {
// Use assembly to "bubble up" return data if available and not
// excessively long.
assembly {
if and(returndatasize(), lt(returndatasize(), 0xffffff)) {
returndatacopy(0, 0, returndatasize())
revert(0, returndatasize())
}
}
// Otherwise, revert with a generic error.
revert BurnRefundFailed();
}
// Mark the owner as having been refunded.
refunded = true;
} else {
// Otherwise, mark the owner as not having been refunded.
refunded = false;
}
// Return whether or not the owner was refunded.
return refunded;
}
/**
* @dev Internal function for deriving the seed of a token from its id, the
* global seed or other entropy source, and the creator of the token.
*
* @param id The id of the token to derive the seed for.
* @param entropy The global seed or other entropy used to derive the seed.
*
* @return The derived seed.
*/
function _getSeed(
uint256 id,
bytes32 entropy
) internal view returns (bytes32) {
// Return seed using id, entropy, & token creator as determinants.
return (
keccak256(
abi.encodePacked(id, entropy)
) & ~bytes32(uint256(type(uint160).max))
) | bytes32(uint256(uint160(_getCreator(id))));
}
/**
* @dev Internal function for rendering pre-reveal animation, a countdown to
* the reveal that is displayed before the token's global seed has been
* set. The countdown ends at the timestamp stored in mintComplete.
*
* @return An html document, base64-encoded, containing a countdown to mint
* completion or a message if the mint phase is over but the reveal
* phase has not been finalized.
*/
function _prerevealAnimation() internal view returns (string memory) {
// Construct and return the pre-reveal animation.
return bytes(
string.concat(
'<!doctypehtml><title>Ret↵rn</title><meta content=0age name=author><style>body{background-color:#000;color:#d3d3d3;display:flex;justify-content:center;align-items:center;height:100vh;margin:0;font-family:Arial,sans-serif;text-align:center}</style><div><h1 id=1></h1><h1 id=2></h1></div><script>let t=new Date(',
mintComplete.toString(),
'e3),m="Waiting for reveal...";let c;function u(){let e=new Date,n=t-e;n<=0?(clearInterval(c),document.getElementById("1").textContent=m,document.getElementById("2").style.display="none"):document.getElementById("2").textContent=[Math.floor(n/864e5),Math.floor(n%864e5/36e5),Math.floor(n%36e5/6e4),Math.floor(n%6e4/1e3)].map(e=>e.toString().padStart(2,"0")).join(":")}new Date<t?(document.getElementById("1").textContent="Waiting for mint to complete",u(),c=setInterval(u,1e3)):document.getElementById("1").textContent=m;</script>'
)
).encode();
}
/**
* @dev Internal view function for retrieving the address of the account
* that minted a specified token. Note that this function can consume
* a significant amount of gas in cases where the creator minted many
* tokens at once. Note that this function assumes that the supplied
* id has been confirmed to exist; otherwise, non-existent tokens will
* be treated as having been created by the most recent creator.
*
* @param id The id of the token in question.
*
* @return creator The address of the account that minted the token.
*/
function _getCreator(uint256 id) internal view returns (address creator) {
// Iterate until a creator has been located.
while (true) {
// Retrieve the creator of the token with the current id.
creator = _creators[id];
// If the retrieved address is not empty, return it.
if (creator != address(0)) {
return creator;
}
// Otherwise, decrement the id and try again.
id -= 1;
}
}
/**
* @dev Internal view function for ensuring that the caller is the account
* currently resolved by the ENS name hash of contract author If the.
* caller is not the author, the transaction will revert.
*
* @return The account resolved by the author's ENS name hash.
*/
function _onlyAuthor() internal view returns (address payable) {
// Retrieve the address resolved by the author's ENS name hash.
address authorAccount = author();
// Revert if caller is not the address resolved by author's name hash.
if (msg.sender != authorAccount) {
revert Unauthorized();
}
// Return the author's account.
return payable(authorAccount);
}
/**
* @dev Internal function for deriving and rendering an SVG image for a token.
* If metadata is not yet revealed, default values are used. Otherwise, it
* is derived using the id and the global seed and returned as a string.
*
* @param id The id of the token.
* @param entropy The global seed value if one has been set via metadata reveal.
* @param seed The seed for the token if one has already been derived. If not
* provided, it will be derived using the id and the global seed.
*
* @return A string representing the SVG image for the token.
*/
function _image(
uint256 id,
bytes32 entropy,
bytes32 seed
) internal view returns (string memory) {
// Declare variables representing visual properties of the token.
string memory arrow;
string memory color;
bool vivid;
// If metadata has not been revealed, use default values.
if (entropy == bytes32(0)) {
arrow = unicode"↵";
color = "#000000";
vivid = false;
} else {
// If a seed has not been provided, derive one using id and entropy.
if (seed == bytes32(0)) {
seed = _getSeed(id, entropy);
}
// Derive the visual properties of the token using the seed.
(,,,, arrow, color,,) = germinate(seed);
vivid = uint8(seed[10]) > 252;
}
// Render & return the SVG image for the token using derived properties.
return _renderImage(arrow, color, vivid);
}
/**
* @dev Internal view function for rendering a dataURI containing an html
* document with web audio code for playing a specific generative
* instance of an audiovisual work using a deterministic seed. Metadata
* is retrieved from a corresponding data contract and the seed is
* inserted into the code before it is base64-encoded and returned as a
* string.
*
* @param seed The seed to use for generating the audiovisual work.
*
* @return The dataURI containing the base64-encoded html audiovisuals.
*/
function _explore(bytes32 seed) internal view returns (string memory) {
return string.concat(
"data:text/html;base64,",
dataContract.encode(seed)
);
}
/**
* @dev Internal pure function for rendering an SVG image for a token using
* the provided visual properties.
*
* @return The SVG image as a string.
*/
function _renderImage(
string memory arrow,
string memory color,
bool vivid
) internal pure returns (string memory) {
return string.concat('<svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"><rect width="100" height="100" fill="', color, '" /><text x="50" y="67" font-size="49" text-anchor="middle" fill="', vivid ? 'white' : 'lightgray', '" font-family="Arial">', arrow, '</text></svg>');
}
/**
* @dev Internal pure function for rendering an array of attributes as a
* JSON string.
*
* @param attributes The attributes to format.
*
* @return The attributes formatted as a string.
*/
function _format(
Attributes memory attributes
) internal pure returns (string memory) {
// Declare variables for storing the two halves of the JSON string.
// This is necessary due to constraints on stack pressure.
string memory a;
string memory b;
// Render the first half of the JSON string.
{
a = string.concat(
'[{"trait_type":"Seed","value":"',
attributes.seed,
'"},{"trait_type":"Tempo","value":"',
attributes.tempo,
'"},{"trait_type":"Vibe","value":"',
attributes.vibe,
'"},{"trait_type":"Root","value":"',
attributes.root,
'"},{"trait_type":"Style","value":"',
attributes.style
);
}
// Render the second half of the JSON string.
{
b = string.concat(
'"},{"trait_type":"Arrow","value":"',
attributes.arrow,
'"},{"trait_type":"Color","value":"',
attributes.color,
'"},{"trait_type":"Tone","value":"',
attributes.tone,
'"},{"trait_type":"Creator","value":"',
attributes.creator
);
}
// Concatenate the two halves and return the result.
return string.concat(a, b, '"}]');
}
/**
* @dev Internal pure function for deconstructing a supplied seed into
* its constituent attributes, represented by an Attributes struct.
*
* @param seed The provided seed.
*
* @return attributes The attributes represented by the seed.
*/
function _getAttributes(
bytes32 seed
) internal pure returns (
Attributes memory attributes
) {
// Encode the seed as a hex string and store it as the seed attribute.
attributes.seed = uint256(seed).toHexString(32);
// Derive the tempo attribute from the seed.
attributes.tempo = (
(uint256(uint8(seed[0])) + 192) % 128 + 64
).toString();
// Derive the vibe attribute from the seed.
attributes.vibe = ["2", "3", "4", "6"][uint8(seed[1]) >> 6];
// Derive the root attribute from the seed.
attributes.root = [
unicode"E₁",
unicode"F₁",
unicode"F♯₁/G♭₁",
unicode"G₁",
unicode"G♯₁/A♭₁",
unicode"A₁",
unicode"A♯₁/B♭₁",
unicode"B₁",
unicode"C₂",
unicode"C♯₂/D♭₂",
unicode"D₂",
unicode"D♯₂/E♭₂",
unicode"E₂",
unicode"F₂",
unicode"F♯₂/G♭₂",
unicode"G₂"
][uint8(seed[2]) >> 4];
// Derive the style attribute from the seed.
attributes.style = (uint8(seed[11]) & 0x0f) == 15
? "16"
: (uint256(uint8(seed[7])) >> 4).toString();
// Derive the arrow attribute from the seed.
attributes.arrow = [
unicode"↵",
unicode"↙",
unicode"↵",
unicode"↜",
unicode"↩",
unicode"↵",
unicode"⇇",
unicode"⇐",
unicode"↵",
unicode"⇤",
unicode"⇦",
unicode"↵",
unicode"⏎",
unicode"↵",
unicode"◀",
unicode"⤶"
][uint8(seed[8]) >> 4];
// Derive the color attribute from the seed.
attributes.tone = uint256(
(uint8(seed[10]) % 16 == 0) && (uint8(seed[11]) >> 4 < 4)
? uint8(seed[11]) >> 4
: 0
).toString();
// Derive the color attribute from the seed.
uint8 startingColorKey = uint8(seed[10]);
if (startingColorKey < 189) {
attributes.color = "#000000";
} else if (startingColorKey < 205) {
attributes.color = "#ffffff";
} else if (startingColorKey < 221) {
attributes.color = "#ff0000";
} else if (startingColorKey < 237) {
attributes.color = "#00ff00";
} else if (startingColorKey < 253) {
attributes.color = "#0000ff";
} else if (startingColorKey < 254) {
attributes.color = "#ffff00";
} else if (startingColorKey < 255) {
attributes.color = "#ff00ff";
} else {
attributes.color = "#00ffff";
}
// Derive the creator attribute from the seed.
attributes.creator = address(uint160(uint256(seed))).toHexString();
// Return the derived attributes.
return attributes;
}
}// SPDX-License-Identifier: MIT
pragma solidity 0.8.20;
// ERC721A Contracts v4.2.3
// Creator: Chiru Labs
/**
* @dev Interface of ERC721 token receiver.
*/
interface ERC721A__IERC721Receiver {
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}
/**
* @dev Interface of ERC721A.
*/
interface IERC721A {
/**
* The caller must own the token or be an approved operator.
*/
error ApprovalCallerNotOwnerNorApproved();
/**
* The token does not exist.
*/
error ApprovalQueryForNonexistentToken();
/**
* Cannot query the balance for the zero address.
*/
error BalanceQueryForZeroAddress();
/**
* Cannot mint to the zero address.
*/
error MintToZeroAddress();
/**
* The quantity of tokens minted must be more than zero.
*/
error MintZeroQuantity();
/**
* The token does not exist.
*/
error OwnerQueryForNonexistentToken();
/**
* The caller must own the token or be an approved operator.
*/
error TransferCallerNotOwnerNorApproved();
/**
* The token must be owned by `from`.
*/
error TransferFromIncorrectOwner();
/**
* Cannot safely transfer to a contract that does not implement the
* ERC721Receiver interface.
*/
error TransferToNonERC721ReceiverImplementer();
/**
* Cannot transfer to the zero address.
*/
error TransferToZeroAddress();
/**
* The token does not exist.
*/
error URIQueryForNonexistentToken();
/**
* The `quantity` minted with ERC2309 exceeds the safety limit.
*/
error MintERC2309QuantityExceedsLimit();
/**
* The `extraData` cannot be set on an unintialized ownership slot.
*/
error OwnershipNotInitializedForExtraData();
// =============================================================
// STRUCTS
// =============================================================
struct TokenOwnership {
// The address of the owner.
address addr;
// Stores the start time of ownership with minimal overhead for tokenomics.
uint64 startTimestamp;
// Whether the token has been burned.
bool burned;
// Arbitrary data similar to `startTimestamp` that can be set via {_extraData}.
uint24 extraData;
}
// =============================================================
// TOKEN COUNTERS
// =============================================================
/**
* @dev Returns the total number of tokens in existence.
* Burned tokens will reduce the count.
* To get the total number of tokens minted, please see {_totalMinted}.
*/
function totalSupply() external view returns (uint256);
// =============================================================
// IERC165
// =============================================================
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* [EIP section](https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified)
* to learn more about how these ids are created.
*
* This function call must use less than 30000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
// =============================================================
// IERC721
// =============================================================
/**
* @dev Emitted when `tokenId` token is transferred from `from` to `to`.
*/
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
*/
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables or disables
* (`approved`) `operator` to manage all of its assets.
*/
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
/**
* @dev Returns the number of tokens in `owner`'s account.
*/
function balanceOf(address owner) external view returns (uint256 balance);
/**
* @dev Returns the owner of the `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function ownerOf(uint256 tokenId) external view returns (address owner);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`,
* checking first that contract recipients are aware of the ERC721 protocol
* to prevent tokens from being forever locked.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be have been allowed to move
* this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement
* {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes calldata data
) external payable;
/**
* @dev Equivalent to `safeTransferFrom(from, to, tokenId, '')`.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) external payable;
/**
* @dev Transfers `tokenId` from `from` to `to`.
*
* WARNING: Usage of this method is discouraged, use {safeTransferFrom}
* whenever possible.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token
* by either {approve} or {setApprovalForAll}.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) external payable;
/**
* @dev Gives permission to `to` to transfer `tokenId` token to another account.
* The approval is cleared when the token is transferred.
*
* Only a single account can be approved at a time, so approving the
* zero address clears previous approvals.
*
* Requirements:
*
* - The caller must own the token or be an approved operator.
* - `tokenId` must exist.
*
* Emits an {Approval} event.
*/
function approve(address to, uint256 tokenId) external payable;
/**
* @dev Approve or remove `operator` as an operator for the caller.
* Operators can call {transferFrom} or {safeTransferFrom}
* for any token owned by the caller.
*
* Requirements:
*
* - The `operator` cannot be the caller.
*
* Emits an {ApprovalForAll} event.
*/
function setApprovalForAll(address operator, bool _approved) external;
/**
* @dev Returns the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function getApproved(uint256 tokenId) external view returns (address operator);
/**
* @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
*
* See {setApprovalForAll}.
*/
function isApprovedForAll(address owner, address operator) external view returns (bool);
// =============================================================
// IERC721Metadata
// =============================================================
/**
* @dev Returns the token collection name.
*/
function name() external view returns (string memory);
/**
* @dev Returns the token collection symbol.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
*/
function tokenURI(uint256 tokenId) external view returns (string memory);
// =============================================================
// IERC2309
// =============================================================
/**
* @dev Emitted when tokens in `fromTokenId` to `toTokenId`
* (inclusive) is transferred from `from` to `to`, as defined in the
* [ERC2309](https://eips.ethereum.org/EIPS/eip-2309) standard.
*
* See {_mintERC2309} for more details.
*/
event ConsecutiveTransfer(uint256 indexed fromTokenId, uint256 toTokenId, address indexed from, address indexed to);
}
/**
* @title ERC721A
*
* @dev Implementation of the [ERC721](https://eips.ethereum.org/EIPS/eip-721)
* Non-Fungible Token Standard, including the Metadata extension.
* Optimized for lower gas during batch mints.
*
* Token IDs are minted in sequential order (e.g. 0, 1, 2, 3, ...)
* starting from `_startTokenId()`.
*
* Assumptions:
*
* - An owner cannot have more than 2**64 - 1 (max value of uint64) of supply.
* - The maximum token ID cannot exceed 2**256 - 1 (max value of uint256).
*/
abstract contract ERC721A is IERC721A {
// Bypass for a `--via-ir` bug (https://github.com/chiru-labs/ERC721A/pull/364).
struct TokenApprovalRef {
address value;
}
// =============================================================
// CONSTANTS
// =============================================================
// Mask of an entry in packed address data.
uint256 private constant _BITMASK_ADDRESS_DATA_ENTRY = (1 << 64) - 1;
// The bit position of `numberMinted` in packed address data.
uint256 private constant _BITPOS_NUMBER_MINTED = 64;
// The bit position of `numberBurned` in packed address data.
uint256 private constant _BITPOS_NUMBER_BURNED = 128;
// The bit position of `aux` in packed address data.
uint256 private constant _BITPOS_AUX = 192;
// Mask of all 256 bits in packed address data except the 64 bits for `aux`.
uint256 private constant _BITMASK_AUX_COMPLEMENT = (1 << 192) - 1;
// The bit position of `startTimestamp` in packed ownership.
uint256 private constant _BITPOS_START_TIMESTAMP = 160;
// The bit mask of the `burned` bit in packed ownership.
uint256 private constant _BITMASK_BURNED = 1 << 224;
// The bit position of the `nextInitialized` bit in packed ownership.
uint256 private constant _BITPOS_NEXT_INITIALIZED = 225;
// The bit mask of the `nextInitialized` bit in packed ownership.
uint256 private constant _BITMASK_NEXT_INITIALIZED = 1 << 225;
// The bit position of `extraData` in packed ownership.
uint256 private constant _BITPOS_EXTRA_DATA = 232;
// Mask of all 256 bits in a packed ownership except the 24 bits for `extraData`.
uint256 private constant _BITMASK_EXTRA_DATA_COMPLEMENT = (1 << 232) - 1;
// The mask of the lower 160 bits for addresses.
uint256 private constant _BITMASK_ADDRESS = (1 << 160) - 1;
// The maximum `quantity` that can be minted with {_mintERC2309}.
// This limit is to prevent overflows on the address data entries.
// For a limit of 5000, a total of 3.689e15 calls to {_mintERC2309}
// is required to cause an overflow, which is unrealistic.
uint256 private constant _MAX_MINT_ERC2309_QUANTITY_LIMIT = 5000;
// The `Transfer` event signature is given by:
// `keccak256(bytes("Transfer(address,address,uint256)"))`.
bytes32 private constant _TRANSFER_EVENT_SIGNATURE =
0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef;
// =============================================================
// STORAGE
// =============================================================
// The next token ID to be minted.
uint256 private _currentIndex;
// The number of tokens burned.
uint256 private _burnCounter;
// Token name
string private _name;
// Token symbol
string private _symbol;
// Mapping from token ID to ownership details
// An empty struct value does not necessarily mean the token is unowned.
// See {_packedOwnershipOf} implementation for details.
//
// Bits Layout:
// - [0..159] `addr`
// - [160..223] `startTimestamp`
// - [224] `burned`
// - [225] `nextInitialized`
// - [232..255] `extraData`
mapping(uint256 => uint256) private _packedOwnerships;
// Mapping owner address to address data.
//
// Bits Layout:
// - [0..63] `balance`
// - [64..127] `numberMinted`
// - [128..191] `numberBurned`
// - [192..255] `aux`
mapping(address => uint256) private _packedAddressData;
// Mapping from token ID to approved address.
mapping(uint256 => TokenApprovalRef) private _tokenApprovals;
// Mapping from owner to operator approvals
mapping(address => mapping(address => bool)) private _operatorApprovals;
// =============================================================
// CONSTRUCTOR
// =============================================================
constructor() {
_currentIndex = _startTokenId();
}
// =============================================================
// TOKEN COUNTING OPERATIONS
// =============================================================
/**
* @dev Returns the starting token ID.
* To change the starting token ID, please override this function.
*/
function _startTokenId() internal view virtual returns (uint256) {
return 0;
}
/**
* @dev Returns the next token ID to be minted.
*/
function _nextTokenId() internal view virtual returns (uint256) {
return _currentIndex;
}
/**
* @dev Returns the total number of tokens in existence.
* Burned tokens will reduce the count.
* To get the total number of tokens minted, please see {_totalMinted}.
*/
function totalSupply() public view virtual override returns (uint256) {
// Counter underflow is impossible as _burnCounter cannot be incremented
// more than `_currentIndex - _startTokenId()` times.
unchecked {
return _currentIndex - _burnCounter - _startTokenId();
}
}
/**
* @dev Returns the total amount of tokens minted in the contract.
*/
function _totalMinted() internal view virtual returns (uint256) {
// Counter underflow is impossible as `_currentIndex` does not decrement,
// and it is initialized to `_startTokenId()`.
unchecked {
return _currentIndex - _startTokenId();
}
}
/**
* @dev Returns the total number of tokens burned.
*/
function _totalBurned() internal view virtual returns (uint256) {
return _burnCounter;
}
// =============================================================
// ADDRESS DATA OPERATIONS
// =============================================================
/**
* @dev Returns the number of tokens in `owner`'s account.
*/
function balanceOf(address owner) public view virtual override returns (uint256) {
if (owner == address(0)) _revert(BalanceQueryForZeroAddress.selector);
return _packedAddressData[owner] & _BITMASK_ADDRESS_DATA_ENTRY;
}
/**
* Returns the number of tokens minted by `owner`.
*/
function _numberMinted(address owner) internal view returns (uint256) {
return (_packedAddressData[owner] >> _BITPOS_NUMBER_MINTED) & _BITMASK_ADDRESS_DATA_ENTRY;
}
/**
* Returns the number of tokens burned by or on behalf of `owner`.
*/
function _numberBurned(address owner) internal view returns (uint256) {
return (_packedAddressData[owner] >> _BITPOS_NUMBER_BURNED) & _BITMASK_ADDRESS_DATA_ENTRY;
}
/**
* Returns the auxiliary data for `owner`. (e.g. number of whitelist mint slots used).
*/
function _getAux(address owner) internal view returns (uint64) {
return uint64(_packedAddressData[owner] >> _BITPOS_AUX);
}
/**
* Sets the auxiliary data for `owner`. (e.g. number of whitelist mint slots used).
* If there are multiple variables, please pack them into a uint64.
*/
function _setAux(address owner, uint64 aux) internal virtual {
uint256 packed = _packedAddressData[owner];
uint256 auxCasted;
// Cast `aux` with assembly to avoid redundant masking.
assembly {
auxCasted := aux
}
packed = (packed & _BITMASK_AUX_COMPLEMENT) | (auxCasted << _BITPOS_AUX);
_packedAddressData[owner] = packed;
}
// =============================================================
// IERC165
// =============================================================
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* [EIP section](https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified)
* to learn more about how these ids are created.
*
* This function call must use less than 30000 gas.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
// The interface IDs are constants representing the first 4 bytes
// of the XOR of all function selectors in the interface.
// See: [ERC165](https://eips.ethereum.org/EIPS/eip-165)
// (e.g. `bytes4(i.functionA.selector ^ i.functionB.selector ^ ...)`)
return
interfaceId == 0x01ffc9a7 || // ERC165 interface ID for ERC165.
interfaceId == 0x80ac58cd || // ERC165 interface ID for ERC721.
interfaceId == 0x5b5e139f; // ERC165 interface ID for ERC721Metadata.
}
// =============================================================
// IERC721Metadata
// =============================================================
/**
* @dev Returns the token collection name.
*/
function name() public view virtual override returns (string memory);
/**
* @dev Returns the token collection symbol.
*/
function symbol() public view virtual override returns (string memory);
/**
* @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
*/
function tokenURI(uint256 tokenId) public view virtual override returns (string memory);
// =============================================================
// OWNERSHIPS OPERATIONS
// =============================================================
/**
* @dev Returns the owner of the `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function ownerOf(uint256 tokenId) public view virtual override returns (address) {
return address(uint160(_packedOwnershipOf(tokenId)));
}
/**
* @dev Gas spent here starts off proportional to the maximum mint batch size.
* It gradually moves to O(1) as tokens get transferred around over time.
*/
function _ownershipOf(uint256 tokenId) internal view virtual returns (TokenOwnership memory) {
return _unpackedOwnership(_packedOwnershipOf(tokenId));
}
/**
* @dev Returns the unpacked `TokenOwnership` struct at `index`.
*/
function _ownershipAt(uint256 index) internal view virtual returns (TokenOwnership memory) {
return _unpackedOwnership(_packedOwnerships[index]);
}
/**
* @dev Returns whether the ownership slot at `index` is initialized.
* An uninitialized slot does not necessarily mean that the slot has no owner.
*/
function _ownershipIsInitialized(uint256 index) internal view virtual returns (bool) {
return _packedOwnerships[index] != 0;
}
/**
* @dev Initializes the ownership slot minted at `index` for efficiency purposes.
*/
function _initializeOwnershipAt(uint256 index) internal virtual {
if (_packedOwnerships[index] == 0) {
_packedOwnerships[index] = _packedOwnershipOf(index);
}
}
/**
* Returns the packed ownership data of `tokenId`.
*/
function _packedOwnershipOf(uint256 tokenId) private view returns (uint256 packed) {
if (_startTokenId() <= tokenId) {
packed = _packedOwnerships[tokenId];
// If the data at the starting slot does not exist, start the scan.
if (packed == 0) {
if (tokenId >= _currentIndex) _revert(OwnerQueryForNonexistentToken.selector);
// Invariant:
// There will always be an initialized ownership slot
// (i.e. `ownership.addr != address(0) && ownership.burned == false`)
// before an unintialized ownership slot
// (i.e. `ownership.addr == address(0) && ownership.burned == false`)
// Hence, `tokenId` will not underflow.
//
// We can directly compare the packed value.
// If the address is zero, packed will be zero.
for (;;) {
unchecked {
packed = _packedOwnerships[--tokenId];
}
if (packed == 0) continue;
if (packed & _BITMASK_BURNED == 0) return packed;
// Otherwise, the token is burned, and we must revert.
// This handles the case of batch burned tokens, where only the burned bit
// of the starting slot is set, and remaining slots are left uninitialized.
_revert(OwnerQueryForNonexistentToken.selector);
}
}
// Otherwise, the data exists and we can skip the scan.
// This is possible because we have already achieved the target condition.
// This saves 2143 gas on transfers of initialized tokens.
// If the token is not burned, return `packed`. Otherwise, revert.
if (packed & _BITMASK_BURNED == 0) return packed;
}
_revert(OwnerQueryForNonexistentToken.selector);
}
/**
* @dev Returns the unpacked `TokenOwnership` struct from `packed`.
*/
function _unpackedOwnership(uint256 packed) private pure returns (TokenOwnership memory ownership) {
ownership.addr = address(uint160(packed));
ownership.startTimestamp = uint64(packed >> _BITPOS_START_TIMESTAMP);
ownership.burned = packed & _BITMASK_BURNED != 0;
ownership.extraData = uint24(packed >> _BITPOS_EXTRA_DATA);
}
/**
* @dev Packs ownership data into a single uint256.
*/
function _packOwnershipData(address owner, uint256 flags) private view returns (uint256 result) {
assembly {
// Mask `owner` to the lower 160 bits, in case the upper bits somehow aren't clean.
owner := and(owner, _BITMASK_ADDRESS)
// `owner | (block.timestamp << _BITPOS_START_TIMESTAMP) | flags`.
result := or(owner, or(shl(_BITPOS_START_TIMESTAMP, timestamp()), flags))
}
}
/**
* @dev Returns the `nextInitialized` flag set if `quantity` equals 1.
*/
function _nextInitializedFlag(uint256 quantity) private pure returns (uint256 result) {
// For branchless setting of the `nextInitialized` flag.
assembly {
// `(quantity == 1) << _BITPOS_NEXT_INITIALIZED`.
result := shl(_BITPOS_NEXT_INITIALIZED, eq(quantity, 1))
}
}
// =============================================================
// APPROVAL OPERATIONS
// =============================================================
/**
* @dev Gives permission to `to` to transfer `tokenId` token to another account. See {ERC721A-_approve}.
*
* Requirements:
*
* - The caller must own the token or be an approved operator.
*/
function approve(address to, uint256 tokenId) public payable virtual override {
_approve(to, tokenId, true);
}
/**
* @dev Returns the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function getApproved(uint256 tokenId) public view virtual override returns (address) {
if (!_exists(tokenId)) _revert(ApprovalQueryForNonexistentToken.selector);
return _tokenApprovals[tokenId].value;
}
/**
* @dev Approve or remove `operator` as an operator for the caller.
* Operators can call {transferFrom} or {safeTransferFrom}
* for any token owned by the caller.
*
* Requirements:
*
* - The `operator` cannot be the caller.
*
* Emits an {ApprovalForAll} event.
*/
function setApprovalForAll(address operator, bool approved) public virtual override {
_operatorApprovals[_msgSenderERC721A()][operator] = approved;
emit ApprovalForAll(_msgSenderERC721A(), operator, approved);
}
/**
* @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
*
* See {setApprovalForAll}.
*/
function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
return _operatorApprovals[owner][operator];
}
/**
* @dev Returns whether `tokenId` exists.
*
* Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
*
* Tokens start existing when they are minted. See {_mint}.
*/
function _exists(uint256 tokenId) internal view virtual returns (bool result) {
if (_startTokenId() <= tokenId) {
if (tokenId < _currentIndex) {
uint256 packed;
while ((packed = _packedOwnerships[tokenId]) == 0) --tokenId;
result = packed & _BITMASK_BURNED == 0;
}
}
}
/**
* @dev Returns whether `msgSender` is equal to `approvedAddress` or `owner`.
*/
function _isSenderApprovedOrOwner(
address approvedAddress,
address owner,
address msgSender
) private pure returns (bool result) {
assembly {
// Mask `owner` to the lower 160 bits, in case the upper bits somehow aren't clean.
owner := and(owner, _BITMASK_ADDRESS)
// Mask `msgSender` to the lower 160 bits, in case the upper bits somehow aren't clean.
msgSender := and(msgSender, _BITMASK_ADDRESS)
// `msgSender == owner || msgSender == approvedAddress`.
result := or(eq(msgSender, owner), eq(msgSender, approvedAddress))
}
}
/**
* @dev Returns the storage slot and value for the approved address of `tokenId`.
*/
function _getApprovedSlotAndAddress(uint256 tokenId)
private
view
returns (uint256 approvedAddressSlot, address approvedAddress)
{
TokenApprovalRef storage tokenApproval = _tokenApprovals[tokenId];
// The following is equivalent to `approvedAddress = _tokenApprovals[tokenId].value`.
assembly {
approvedAddressSlot := tokenApproval.slot
approvedAddress := sload(approvedAddressSlot)
}
}
// =============================================================
// TRANSFER OPERATIONS
// =============================================================
/**
* @dev Transfers `tokenId` from `from` to `to`.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token
* by either {approve} or {setApprovalForAll}.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) public payable virtual override {
uint256 prevOwnershipPacked = _packedOwnershipOf(tokenId);
// Mask `from` to the lower 160 bits, in case the upper bits somehow aren't clean.
from = address(uint160(uint256(uint160(from)) & _BITMASK_ADDRESS));
if (address(uint160(prevOwnershipPacked)) != from) _revert(TransferFromIncorrectOwner.selector);
(uint256 approvedAddressSlot, address approvedAddress) = _getApprovedSlotAndAddress(tokenId);
// The nested ifs save around 20+ gas over a compound boolean condition.
if (!_isSenderApprovedOrOwner(approvedAddress, from, _msgSenderERC721A()))
if (!isApprovedForAll(from, _msgSenderERC721A())) _revert(TransferCallerNotOwnerNorApproved.selector);
_beforeTokenTransfers(from, to, tokenId, 1);
// Clear approvals from the previous owner.
assembly {
if approvedAddress {
// This is equivalent to `delete _tokenApprovals[tokenId]`.
sstore(approvedAddressSlot, 0)
}
}
// Underflow of the sender's balance is impossible because we check for
// ownership above and the recipient's balance can't realistically overflow.
// Counter overflow is incredibly unrealistic as `tokenId` would have to be 2**256.
unchecked {
// We can directly increment and decrement the balances.
--_packedAddressData[from]; // Updates: `balance -= 1`.
++_packedAddressData[to]; // Updates: `balance += 1`.
// Updates:
// - `address` to the next owner.
// - `startTimestamp` to the timestamp of transfering.
// - `burned` to `false`.
// - `nextInitialized` to `true`.
_packedOwnerships[tokenId] = _packOwnershipData(
to,
_BITMASK_NEXT_INITIALIZED | _nextExtraData(from, to, prevOwnershipPacked)
);
// If the next slot may not have been initialized (i.e. `nextInitialized == false`) .
if (prevOwnershipPacked & _BITMASK_NEXT_INITIALIZED == 0) {
uint256 nextTokenId = tokenId + 1;
// If the next slot's address is zero and not burned (i.e. packed value is zero).
if (_packedOwnerships[nextTokenId] == 0) {
// If the next slot is within bounds.
if (nextTokenId != _currentIndex) {
// Initialize the next slot to maintain correctness for `ownerOf(tokenId + 1)`.
_packedOwnerships[nextTokenId] = prevOwnershipPacked;
}
}
}
}
// Mask `to` to the lower 160 bits, in case the upper bits somehow aren't clean.
uint256 toMasked = uint256(uint160(to)) & _BITMASK_ADDRESS;
assembly {
// Emit the `Transfer` event.
log4(
0, // Start of data (0, since no data).
0, // End of data (0, since no data).
_TRANSFER_EVENT_SIGNATURE, // Signature.
from, // `from`.
toMasked, // `to`.
tokenId // `tokenId`.
)
}
if (toMasked == 0) _revert(TransferToZeroAddress.selector);
_afterTokenTransfers(from, to, tokenId, 1);
}
/**
* @dev Equivalent to `safeTransferFrom(from, to, tokenId, '')`.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) public payable virtual override {
safeTransferFrom(from, to, tokenId, '');
}
/**
* @dev Safely transfers `tokenId` token from `from` to `to`.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token
* by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement
* {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes memory _data
) public payable virtual override {
transferFrom(from, to, tokenId);
if (to.code.length != 0)
if (!_checkContractOnERC721Received(from, to, tokenId, _data)) {
_revert(TransferToNonERC721ReceiverImplementer.selector);
}
}
/**
* @dev Hook that is called before a set of serially-ordered token IDs
* are about to be transferred. This includes minting.
* And also called before burning one token.
*
* `startTokenId` - the first token ID to be transferred.
* `quantity` - the amount to be transferred.
*
* Calling conditions:
*
* - When `from` and `to` are both non-zero, `from`'s `tokenId` will be
* transferred to `to`.
* - When `from` is zero, `tokenId` will be minted for `to`.
* - When `to` is zero, `tokenId` will be burned by `from`.
* - `from` and `to` are never both zero.
*/
function _beforeTokenTransfers(
address from,
address to,
uint256 startTokenId,
uint256 quantity
) internal virtual {}
/**
* @dev Hook that is called after a set of serially-ordered token IDs
* have been transferred. This includes minting.
* And also called after one token has been burned.
*
* `startTokenId` - the first token ID to be transferred.
* `quantity` - the amount to be transferred.
*
* Calling conditions:
*
* - When `from` and `to` are both non-zero, `from`'s `tokenId` has been
* transferred to `to`.
* - When `from` is zero, `tokenId` has been minted for `to`.
* - When `to` is zero, `tokenId` has been burned by `from`.
* - `from` and `to` are never both zero.
*/
function _afterTokenTransfers(
address from,
address to,
uint256 startTokenId,
uint256 quantity
) internal virtual {}
/**
* @dev Private function to invoke {IERC721Receiver-onERC721Received} on a target contract.
*
* `from` - Previous owner of the given token ID.
* `to` - Target address that will receive the token.
* `tokenId` - Token ID to be transferred.
* `_data` - Optional data to send along with the call.
*
* Returns whether the call correctly returned the expected magic value.
*/
function _checkContractOnERC721Received(
address from,
address to,
uint256 tokenId,
bytes memory _data
) private returns (bool) {
try ERC721A__IERC721Receiver(to).onERC721Received(_msgSenderERC721A(), from, tokenId, _data) returns (
bytes4 retval
) {
return retval == ERC721A__IERC721Receiver(to).onERC721Received.selector;
} catch (bytes memory reason) {
if (reason.length == 0) {
_revert(TransferToNonERC721ReceiverImplementer.selector);
}
assembly {
revert(add(32, reason), mload(reason))
}
}
}
// =============================================================
// MINT OPERATIONS
// =============================================================
/**
* @dev Mints `quantity` tokens and transfers them to `to`.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - `quantity` must be greater than 0.
*
* Emits a {Transfer} event for each mint.
*/
function _mint(address to, uint256 quantity) internal virtual {
uint256 startTokenId = _currentIndex;
if (quantity == 0) _revert(MintZeroQuantity.selector);
_beforeTokenTransfers(address(0), to, startTokenId, quantity);
// Overflows are incredibly unrealistic.
// `balance` and `numberMinted` have a maximum limit of 2**64.
// `tokenId` has a maximum limit of 2**256.
unchecked {
// Updates:
// - `address` to the owner.
// - `startTimestamp` to the timestamp of minting.
// - `burned` to `false`.
// - `nextInitialized` to `quantity == 1`.
_packedOwnerships[startTokenId] = _packOwnershipData(
to,
_nextInitializedFlag(quantity) | _nextExtraData(address(0), to, 0)
);
// Updates:
// - `balance += quantity`.
// - `numberMinted += quantity`.
//
// We can directly add to the `balance` and `numberMinted`.
_packedAddressData[to] += quantity * ((1 << _BITPOS_NUMBER_MINTED) | 1);
// Mask `to` to the lower 160 bits, in case the upper bits somehow aren't clean.
uint256 toMasked = uint256(uint160(to)) & _BITMASK_ADDRESS;
if (toMasked == 0) _revert(MintToZeroAddress.selector);
uint256 end = startTokenId + quantity;
uint256 tokenId = startTokenId;
do {
assembly {
// Emit the `Transfer` event.
log4(
0, // Start of data (0, since no data).
0, // End of data (0, since no data).
_TRANSFER_EVENT_SIGNATURE, // Signature.
0, // `address(0)`.
toMasked, // `to`.
tokenId // `tokenId`.
)
}
// The `!=` check ensures that large values of `quantity`
// that overflows uint256 will make the loop run out of gas.
} while (++tokenId != end);
_currentIndex = end;
}
_afterTokenTransfers(address(0), to, startTokenId, quantity);
}
/**
* @dev Mints `quantity` tokens and transfers them to `to`.
*
* This function is intended for efficient minting only during contract creation.
*
* It emits only one {ConsecutiveTransfer} as defined in
* [ERC2309](https://eips.ethereum.org/EIPS/eip-2309),
* instead of a sequence of {Transfer} event(s).
*
* Calling this function outside of contract creation WILL make your contract
* non-compliant with the ERC721 standard.
* For full ERC721 compliance, substituting ERC721 {Transfer} event(s) with the ERC2309
* {ConsecutiveTransfer} event is only permissible during contract creation.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - `quantity` must be greater than 0.
*
* Emits a {ConsecutiveTransfer} event.
*/
function _mintERC2309(address to, uint256 quantity) internal virtual {
uint256 startTokenId = _currentIndex;
if (to == address(0)) _revert(MintToZeroAddress.selector);
if (quantity == 0) _revert(MintZeroQuantity.selector);
if (quantity > _MAX_MINT_ERC2309_QUANTITY_LIMIT) _revert(MintERC2309QuantityExceedsLimit.selector);
_beforeTokenTransfers(address(0), to, startTokenId, quantity);
// Overflows are unrealistic due to the above check for `quantity` to be below the limit.
unchecked {
// Updates:
// - `balance += quantity`.
// - `numberMinted += quantity`.
//
// We can directly add to the `balance` and `numberMinted`.
_packedAddressData[to] += quantity * ((1 << _BITPOS_NUMBER_MINTED) | 1);
// Updates:
// - `address` to the owner.
// - `startTimestamp` to the timestamp of minting.
// - `burned` to `false`.
// - `nextInitialized` to `quantity == 1`.
_packedOwnerships[startTokenId] = _packOwnershipData(
to,
_nextInitializedFlag(quantity) | _nextExtraData(address(0), to, 0)
);
emit ConsecutiveTransfer(startTokenId, startTokenId + quantity - 1, address(0), to);
_currentIndex = startTokenId + quantity;
}
_afterTokenTransfers(address(0), to, startTokenId, quantity);
}
/**
* @dev Safely mints `quantity` tokens and transfers them to `to`.
*
* Requirements:
*
* - If `to` refers to a smart contract, it must implement
* {IERC721Receiver-onERC721Received}, which is called for each safe transfer.
* - `quantity` must be greater than 0.
*
* See {_mint}.
*
* Emits a {Transfer} event for each mint.
*/
function _safeMint(
address to,
uint256 quantity,
bytes memory _data
) internal virtual {
_mint(to, quantity);
unchecked {
if (to.code.length != 0) {
uint256 end = _currentIndex;
uint256 index = end - quantity;
do {
if (!_checkContractOnERC721Received(address(0), to, index++, _data)) {
_revert(TransferToNonERC721ReceiverImplementer.selector);
}
} while (index < end);
// Reentrancy protection.
if (_currentIndex != end) _revert(bytes4(0));
}
}
}
/**
* @dev Equivalent to `_safeMint(to, quantity, '')`.
*/
function _safeMint(address to, uint256 quantity) internal virtual {
_safeMint(to, quantity, '');
}
// =============================================================
// APPROVAL OPERATIONS
// =============================================================
/**
* @dev Equivalent to `_approve(to, tokenId, false)`.
*/
function _approve(address to, uint256 tokenId) internal virtual {
_approve(to, tokenId, false);
}
/**
* @dev Gives permission to `to` to transfer `tokenId` token to another account.
* The approval is cleared when the token is transferred.
*
* Only a single account can be approved at a time, so approving the
* zero address clears previous approvals.
*
* Requirements:
*
* - `tokenId` must exist.
*
* Emits an {Approval} event.
*/
function _approve(
address to,
uint256 tokenId,
bool approvalCheck
) internal virtual {
address owner = ownerOf(tokenId);
if (approvalCheck && _msgSenderERC721A() != owner)
if (!isApprovedForAll(owner, _msgSenderERC721A())) {
_revert(ApprovalCallerNotOwnerNorApproved.selector);
}
_tokenApprovals[tokenId].value = to;
emit Approval(owner, to, tokenId);
}
// =============================================================
// BURN OPERATIONS
// =============================================================
/**
* @dev Equivalent to `_burn(tokenId, false)`.
*/
function _burn(uint256 tokenId) internal virtual {
_burn(tokenId, false);
}
/**
* @dev Destroys `tokenId`.
* The approval is cleared when the token is burned.
*
* Requirements:
*
* - `tokenId` must exist.
*
* Emits a {Transfer} event.
*/
function _burn(uint256 tokenId, bool approvalCheck) internal virtual {
uint256 prevOwnershipPacked = _packedOwnershipOf(tokenId);
address from = address(uint160(prevOwnershipPacked));
(uint256 approvedAddressSlot, address approvedAddress) = _getApprovedSlotAndAddress(tokenId);
if (approvalCheck) {
// The nested ifs save around 20+ gas over a compound boolean condition.
if (!_isSenderApprovedOrOwner(approvedAddress, from, _msgSenderERC721A()))
if (!isApprovedForAll(from, _msgSenderERC721A())) _revert(TransferCallerNotOwnerNorApproved.selector);
}
_beforeTokenTransfers(from, address(0), tokenId, 1);
// Clear approvals from the previous owner.
assembly {
if approvedAddress {
// This is equivalent to `delete _tokenApprovals[tokenId]`.
sstore(approvedAddressSlot, 0)
}
}
// Underflow of the sender's balance is impossible because we check for
// ownership above and the recipient's balance can't realistically overflow.
// Counter overflow is incredibly unrealistic as `tokenId` would have to be 2**256.
unchecked {
// Updates:
// - `balance -= 1`.
// - `numberBurned += 1`.
//
// We can directly decrement the balance, and increment the number burned.
// This is equivalent to `packed -= 1; packed += 1 << _BITPOS_NUMBER_BURNED;`.
_packedAddressData[from] += (1 << _BITPOS_NUMBER_BURNED) - 1;
// Updates:
// - `address` to the last owner.
// - `startTimestamp` to the timestamp of burning.
// - `burned` to `true`.
// - `nextInitialized` to `true`.
_packedOwnerships[tokenId] = _packOwnershipData(
from,
(_BITMASK_BURNED | _BITMASK_NEXT_INITIALIZED) | _nextExtraData(from, address(0), prevOwnershipPacked)
);
// If the next slot may not have been initialized (i.e. `nextInitialized == false`) .
if (prevOwnershipPacked & _BITMASK_NEXT_INITIALIZED == 0) {
uint256 nextTokenId = tokenId + 1;
// If the next slot's address is zero and not burned (i.e. packed value is zero).
if (_packedOwnerships[nextTokenId] == 0) {
// If the next slot is within bounds.
if (nextTokenId != _currentIndex) {
// Initialize the next slot to maintain correctness for `ownerOf(tokenId + 1)`.
_packedOwnerships[nextTokenId] = prevOwnershipPacked;
}
}
}
}
emit Transfer(from, address(0), tokenId);
_afterTokenTransfers(from, address(0), tokenId, 1);
// Overflow not possible, as _burnCounter cannot be exceed _currentIndex times.
unchecked {
_burnCounter++;
}
}
// =============================================================
// EXTRA DATA OPERATIONS
// =============================================================
/**
* @dev Directly sets the extra data for the ownership data `index`.
*/
function _setExtraDataAt(uint256 index, uint24 extraData) internal virtual {
uint256 packed = _packedOwnerships[index];
if (packed == 0) _revert(OwnershipNotInitializedForExtraData.selector);
uint256 extraDataCasted;
// Cast `extraData` with assembly to avoid redundant masking.
assembly {
extraDataCasted := extraData
}
packed = (packed & _BITMASK_EXTRA_DATA_COMPLEMENT) | (extraDataCasted << _BITPOS_EXTRA_DATA);
_packedOwnerships[index] = packed;
}
/**
* @dev Called during each token transfer to set the 24bit `extraData` field.
* Intended to be overridden by the cosumer contract.
*
* `previousExtraData` - the value of `extraData` before transfer.
*
* Calling conditions:
*
* - When `from` and `to` are both non-zero, `from`'s `tokenId` will be
* transferred to `to`.
* - When `from` is zero, `tokenId` will be minted for `to`.
* - When `to` is zero, `tokenId` will be burned by `from`.
* - `from` and `to` are never both zero.
*/
function _extraData(
address from,
address to,
uint24 previousExtraData
) internal view virtual returns (uint24) {}
/**
* @dev Returns the next extra data for the packed ownership data.
* The returned result is shifted into position.
*/
function _nextExtraData(
address from,
address to,
uint256 prevOwnershipPacked
) private view returns (uint256) {
uint24 extraData = uint24(prevOwnershipPacked >> _BITPOS_EXTRA_DATA);
return uint256(_extraData(from, to, extraData)) << _BITPOS_EXTRA_DATA;
}
// =============================================================
// OTHER OPERATIONS
// =============================================================
/**
* @dev Returns the message sender (defaults to `msg.sender`).
*
* If you are writing GSN compatible contracts, you need to override this function.
*/
function _msgSenderERC721A() internal view virtual returns (address) {
return msg.sender;
}
/**
* @dev Converts a uint256 to its ASCII string decimal representation.
*/
function _toString(uint256 value) internal pure virtual returns (string memory str) {
assembly {
// The maximum value of a uint256 contains 78 digits (1 byte per digit), but
// we allocate 0xa0 bytes to keep the free memory pointer 32-byte word aligned.
// We will need 1 word for the trailing zeros padding, 1 word for the length,
// and 3 words for a maximum of 78 digits. Total: 5 * 0x20 = 0xa0.
let m := add(mload(0x40), 0xa0)
// Update the free memory pointer to allocate.
mstore(0x40, m)
// Assign the `str` to the end.
str := sub(m, 0x20)
// Zeroize the slot after the string.
mstore(str, 0)
// Cache the end of the memory to calculate the length later.
let end := str
// We write the string from rightmost digit to leftmost digit.
// The following is essentially a do-while loop that also handles the zero case.
// prettier-ignore
for { let temp := value } 1 {} {
str := sub(str, 1)
// Write the character to the pointer.
// The ASCII index of the '0' character is 48.
mstore8(str, add(48, mod(temp, 10)))
// Keep dividing `temp` until zero.
temp := div(temp, 10)
// prettier-ignore
if iszero(temp) { break }
}
let length := sub(end, str)
// Move the pointer 32 bytes leftwards to make room for the length.
str := sub(str, 0x20)
// Store the length.
mstore(str, length)
}
}
/**
* @dev For more efficient reverts.
*/
function _revert(bytes4 errorSelector) internal pure {
assembly {
mstore(0x00, errorSelector)
revert(0x00, 0x04)
}
}
}
interface IENS {
function resolver(bytes32 node) external view returns (IResolver);
}
interface IResolver {
function addr(bytes32 node) external view returns (address);
}
interface IENSReverseRegistrar {
function setName(string calldata name) external;
}
/// [MIT License]
/// @title Base64
/// @notice Provides a function for encoding some bytes in base64
/// @author Brecht Devos <[email protected]>
library Base64 {
bytes internal constant TABLE = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
/// @notice Encodes some bytes to the base64 representation
function encode(bytes memory data) internal pure returns (string memory) {
uint256 len = data.length;
if (len == 0) return "";
// multiply by 4/3 rounded up
uint256 encodedLen = 4 * ((len + 2) / 3);
// Add some extra buffer at the end
bytes memory result = new bytes(encodedLen + 32);
bytes memory table = TABLE;
assembly {
let tablePtr := add(table, 1)
let resultPtr := add(result, 32)
for {
let i := 0
} lt(i, len) {
} {
i := add(i, 3)
let input := and(mload(add(data, i)), 0xffffff)
let out := mload(add(tablePtr, and(shr(18, input), 0x3F)))
out := shl(8, out)
out := add(out, and(mload(add(tablePtr, and(shr(12, input), 0x3F))), 0xFF))
out := shl(8, out)
out := add(out, and(mload(add(tablePtr, and(shr(6, input), 0x3F))), 0xFF))
out := shl(8, out)
out := add(out, and(mload(add(tablePtr, and(input, 0x3F))), 0xFF))
out := shl(224, out)
mstore(resultPtr, out)
resultPtr := add(resultPtr, 4)
}
switch mod(len, 3)
case 1 {
mstore(sub(resultPtr, 2), shl(240, 0x3d3d))
}
case 2 {
mstore(sub(resultPtr, 1), shl(248, 0x3d))
}
mstore(result, encodedLen)
}
return string(result);
}
}
/**
* @dev Standard math utilities missing in the Solidity language.
*/
library Math {
/**
* @dev Return the log in base 10, rounded down, of a positive value.
* Returns 0 if given 0.
*/
function log10(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >= 10 ** 64) {
value /= 10 ** 64;
result += 64;
}
if (value >= 10 ** 32) {
value /= 10 ** 32;
result += 32;
}
if (value >= 10 ** 16) {
value /= 10 ** 16;
result += 16;
}
if (value >= 10 ** 8) {
value /= 10 ** 8;
result += 8;
}
if (value >= 10 ** 4) {
value /= 10 ** 4;
result += 4;
}
if (value >= 10 ** 2) {
value /= 10 ** 2;
result += 2;
}
if (value >= 10 ** 1) {
result += 1;
}
}
return result;
}
}
/**
* @dev String operations.
*/
library Strings {
bytes16 private constant _SYMBOLS = "0123456789abcdef";
uint8 private constant _ADDRESS_LENGTH = 20;
/**
* @dev The `value` string doesn't fit in the specified `length`.
*/
error StringsInsufficientHexLength(uint256 value, uint256 length);
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
*/
function toString(uint256 value) internal pure returns (string memory) {
unchecked {
uint256 length = Math.log10(value) + 1;
string memory buffer = new string(length);
uint256 ptr;
/// @solidity memory-safe-assembly
assembly {
ptr := add(buffer, add(32, length))
}
while (true) {
ptr--;
/// @solidity memory-safe-assembly
assembly {
mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
}
value /= 10;
if (value == 0) break;
}
return buffer;
}
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
*/
function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
uint256 localValue = value;
bytes memory buffer = new bytes(2 * length + 2);
buffer[0] = "0";
buffer[1] = "x";
for (uint256 i = 2 * length + 1; i > 1; --i) {
buffer[i] = _SYMBOLS[localValue & 0xf];
localValue >>= 4;
}
if (localValue != 0) {
revert StringsInsufficientHexLength(value, length);
}
return string(buffer);
}
/**
* @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
*/
function toHexString(address addr) internal pure returns (string memory) {
return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
}
}
/**
* @dev Library for interacting with the Ret_rn data contract.
*/
library DataContract {
using Base64 for bytes;
function bytes32ToStringRepresentationInBytes32(bytes32 x) public pure returns (bytes32 y, bytes32 z) {
bytes memory hexChar = bytes("0123456789abcdef");
bytes memory str = new bytes(64);
for (uint256 i = 0; i < 32; i++) {
bytes1 b = bytes1(uint8(uint256(x) / (2**(8*(31 - i)))));
str[i*2] = bytes1(uint8(hexChar[uint256(uint8(b)/16)]));
str[1+i*2] = bytes1(uint8(hexChar[uint256(uint8(b)%16)]));
}
(y, z) = abi.decode(str, (bytes32, bytes32));
}
function encode(address dataContract, bytes32 seed) internal view returns (string memory) {
(bytes32 y, bytes32 z) = bytes32ToStringRepresentationInBytes32(seed);
bytes memory data = new bytes(19466);
assembly {
extcodecopy(dataContract, add(data, 0x20), 1, 19466)
mstore(add(data, add(0x20, 894)), y)
mstore(add(data, add(0x40, 894)), z)
}
return data.encode();
}
}{
"remappings": [
"ds-test/=lib/forge-std/lib/ds-test/src/",
"forge-std/=lib/forge-std/src/"
],
"optimizer": {
"enabled": true,
"runs": 9999999
},
"metadata": {
"useLiteralContent": false,
"bytecodeHash": "ipfs",
"appendCBOR": true
},
"outputSelection": {
"*": {
"*": [
"evm.bytecode",
"evm.deployedBytecode",
"devdoc",
"userdoc",
"metadata",
"abi"
]
}
},
"evmVersion": "paris",
"viaIR": true,
"libraries": {}
}Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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function"},{"inputs":[{"internalType":"bytes32","name":"seed","type":"bytes32"}],"name":"explore","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"seed","type":"bytes32"}],"name":"germinate","outputs":[{"internalType":"string","name":"tempo","type":"string"},{"internalType":"string","name":"vibe","type":"string"},{"internalType":"string","name":"root","type":"string"},{"internalType":"string","name":"style","type":"string"},{"internalType":"string","name":"arrow","type":"string"},{"internalType":"string","name":"color","type":"string"},{"internalType":"string","name":"tone","type":"string"},{"internalType":"string","name":"creator","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"id","type":"uint256"}],"name":"getCreator","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"id","type":"uint256"}],"name":"getSeed","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"globalSeed","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"id","type":"uint256"}],"name":"image","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"mint","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"mintComplete","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"prepareReveal","outputs":[{"internalType":"uint256","name":"firstAvailableRevealBlockNumber","type":"uint256"},{"internalType":"uint256","name":"lastAvailableRevealBlockNumber","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"commitMessage","type":"string"}],"name":"reveal","outputs":[{"internalType":"bytes32","name":"finalizedSeed","type":"bytes32"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"revealEntropyBlockNumber","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"id","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"",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Creation Code
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