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Latest 25 from a total of 275 transactions
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Purchase Episode... | 20293104 | 7 days ago | IN | 0 ETH | 0.00029651 | ||||
Purchase Episode... | 20262906 | 11 days ago | IN | 0 ETH | 0.00075319 | ||||
Purchase Episode... | 20207461 | 19 days ago | IN | 0 ETH | 0.00017959 | ||||
Purchase Episode... | 20207066 | 19 days ago | IN | 0 ETH | 0.00037461 | ||||
Purchase Episode... | 19936923 | 56 days ago | IN | 0 ETH | 0.00063644 | ||||
Purchase Episode... | 19903065 | 61 days ago | IN | 0 ETH | 0.00026575 | ||||
Purchase Episode... | 19885750 | 64 days ago | IN | 0 ETH | 0.00028732 | ||||
Purchase Episode... | 19877491 | 65 days ago | IN | 0 ETH | 0.0007018 | ||||
Purchase Episode... | 19835132 | 71 days ago | IN | 0 ETH | 0.00033109 | ||||
Purchase Episode... | 19826037 | 72 days ago | IN | 0 ETH | 0.00083375 | ||||
Purchase Episode... | 19825596 | 72 days ago | IN | 0 ETH | 0.00050394 | ||||
Purchase Episode... | 19799415 | 76 days ago | IN | 0 ETH | 0.00040332 | ||||
Purchase Episode... | 19770000 | 80 days ago | IN | 0 ETH | 0.00103398 | ||||
Purchase Episode... | 19751735 | 82 days ago | IN | 0 ETH | 0.00040271 | ||||
Purchase Episode... | 19723478 | 86 days ago | IN | 0 ETH | 0.00108739 | ||||
Purchase Episode... | 19671285 | 94 days ago | IN | 0 ETH | 0.00061919 | ||||
Purchase Episode... | 19654394 | 96 days ago | IN | 0 ETH | 0.00105819 | ||||
Purchase Episode... | 19612692 | 102 days ago | IN | 0 ETH | 0.00373633 | ||||
Purchase Episode... | 19611957 | 102 days ago | IN | 0 ETH | 0.00271595 | ||||
Purchase Episode... | 19508993 | 116 days ago | IN | 0 ETH | 0.00136901 | ||||
Purchase Episode... | 19458504 | 123 days ago | IN | 0 ETH | 0.00220831 | ||||
Purchase Episode... | 19415084 | 130 days ago | IN | 0 ETH | 0.00577256 | ||||
Purchase Episode... | 19385229 | 134 days ago | IN | 0 ETH | 0.00665458 | ||||
Purchase Episode... | 19367183 | 136 days ago | IN | 0 ETH | 0.00633641 | ||||
Purchase Episode... | 19364751 | 137 days ago | IN | 0 ETH | 0.00767265 |
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Contract Name:
KillerWhalesS1
Compiler Version
v0.8.19+commit.7dd6d404
Optimization Enabled:
Yes with 1000000 runs
Other Settings:
paris EvmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.19; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol"; import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol"; ///@notice The owner will always be a multisig wallet. /* -------------------------------------------------------------------------- */ /* errors */ /* -------------------------------------------------------------------------- */ error InsufficientEth(); error EpisodeDoesNotExist(); error EpisodeAlreadyPurchased(); error NotOwnerOrAdmin(); error SignerCannotBeZeroAddress(); error InvalidSignature(); error VoucherExpired(); error CannotPurchaseWithoutSignerApproval(); error ErrWithdrawingETH(); /* -------------------------------------------------------------------------- */ /* KillerWhalesS1 */ /* -------------------------------------------------------------------------- */ /** * @title Contract for purchasing episodes for Season 1 of KillerWhales using HelloToken * @author 0xSimon */ contract KillerWhalesS1 is Ownable { using ECDSA for bytes32; /* -------------------------------------------------------------------------- */ /* events */ /* -------------------------------------------------------------------------- */ /** * @notice emits when an episode is purchased by a user */ event EpisodesPurchased(address indexed user, uint256[] episode); event SeasonPassPurchased(address indexed user); event SignerChanged(address signer); event SignerOnlyChanged(bool signerOnly); event PricePerEpisodeChanged(uint256 pricePerEpisode); /* -------------------------------------------------------------------------- */ /* statse */ /* -------------------------------------------------------------------------- */ /** * @dev The max episodeID (i.e. available episodes 0, 1, ..., 4) */ uint256 private constant MAX_EPISODE_ID = 4; /** * @notice The Bitpos if a user owns the season pass */ uint256 private constant OWNS_SEASON_PASS_BITPOS = (1 << 255); /** * @notice The HelloToken contract */ IERC20 public immutable HELLO_TOKEN; /** * @notice The price per episode */ uint256 public pricePerEpisode = 1 ether; /** * @notice The signer providing signatures for discounts on episodes */ address public signer; /** * @notice if true, episodes can only be purchased through signatures */ bool public signerOnly; /** * @notice A mapping that stores purchased episodes for every user * @dev Maps between an address to a bitmap that contains purchased episodes * @dev Assumptions: * - There are only 5 episodes in Season 1 therefore the bitmap can never overflow * Examples: * - If a user has purchased episode 0, the bitmap would look like: * 00000001 * - If a user has purchased episodes 1 & 3, the bitmap would look like: * 00001010 */ mapping(address => uint256) public episodePurchasedBitmap; /* -------------------------------------------------------------------------- */ /* constructor */ /* -------------------------------------------------------------------------- */ /** * @notice Deploys the contract and saves the HelloToken contract address and the signer * @dev `msg.sender` is assigned to the owner, pay attention if this contract is deployed via another contract * @param _helloToken The address of HelloToken * @param _signer Address of the discount signer */ constructor(address _helloToken, address _signer) { HELLO_TOKEN = IERC20(_helloToken); if (_signer == address(0)) { _revert(SignerCannotBeZeroAddress.selector); } signer = _signer; } /* -------------------------------------------------------------------------- */ /* external */ /* -------------------------------------------------------------------------- */ /** * @notice Purchase episodes without discount * @notice HelloTokens will be transferred to this contract * @notice Ensure approvals for HelloToken has been set * @param episodeIds the episodeIDs to be purchased * @dev Reverts if the any of the episodes in the argument has been purchased already * @dev Reverts if the any of the episodes in the argument does not exist (i.e. > MAX_EPISODE_ID) */ function purchaseEpisodesNoDiscount(uint256[] calldata episodeIds) external { if (signerOnly) { _revert(CannotPurchaseWithoutSignerApproval.selector); } // calculate total price uint256 __totalPrice = episodeIds.length * pricePerEpisode; // update state _grantEpisodes(msg.sender, episodeIds); // transfer tokens HELLO_TOKEN.transferFrom(msg.sender, address(this), __totalPrice); } /** * @notice Purchase espidoes with discount * @notice HelloTokens will be transferred to this contract * @notice Ensure approvals for HelloToken has been set * @param episodeIds the episodeIDs to be purchased * @param _discount the discount to be applied in basisPoint (e.g. 500 for 5% discount) * @param _expirationTimestamp the expiration timestamp for which this discount can be applied * @param signature the signature signed by `signer` */ function purchaseEpisodeWithDiscount( uint256[] calldata episodeIds, uint256 _discount, uint256 _expirationTimestamp, bytes calldata signature ) external { if (signerOnly) { _revert(CannotPurchaseWithoutSignerApproval.selector); } // check signature _checkDiscountSignature(episodeIds, _discount, _expirationTimestamp, signature); // calculate total price - discount uint256 __totalPrice = episodeIds.length * pricePerEpisode * (10_000 - _discount) / 10_000; // update state _grantEpisodes(msg.sender, episodeIds); // transfer tokens HELLO_TOKEN.transferFrom(msg.sender, address(this), __totalPrice); } /// @notice Purchase episodes with a total price and signature /// @notice HelloTokens will be transferred to this contract /// @notice grant episodes to the user /// @param episodeIds the episodeIDs to be purchased /// @param totalPrice the total price of the episodes /// @param _expirationTimestamp the expiration timestamp for which this price is applied /// @param signature the signature signed by `signer` function purchaseEpisodesSignatureOnly( uint256[] calldata episodeIds, uint256 totalPrice, uint256 _expirationTimestamp, bytes calldata signature ) external { // check signature _checkTotalPriceSignature(episodeIds, totalPrice, _expirationTimestamp, signature); // update state _grantEpisodes(msg.sender, episodeIds); // transfer tokens HELLO_TOKEN.transferFrom(msg.sender, address(this), totalPrice); } /* -------------------------------------------------------------------------- */ /* owner */ /* -------------------------------------------------------------------------- */ /** * @notice Owner only - Updates the address of the discount signer * @param _signer Address of the discount signer */ function setSigner(address _signer) external onlyOwner { if (_signer == address(0)) { _revert(SignerCannotBeZeroAddress.selector); } signer = _signer; emit SignerChanged(_signer); } /** * @notice Owner only - Updates the signerOnly flag * @param _signerOnly if true, episodes can only be purchased through signatures */ function setSignerOnly(bool _signerOnly) external onlyOwner { signerOnly = _signerOnly; emit SignerOnlyChanged(_signerOnly); } /** * @notice Owner only - Updates the price per episode * @param _price Price per episode */ function setPricePerEpisode(uint256 _price) external onlyOwner { pricePerEpisode = _price; emit PricePerEpisodeChanged(_price); } /** * @notice sends all the eth in the contract to the owner */ function withdrawETH() external onlyOwner { (bool os,) = payable(msg.sender).call{value: address(this).balance}(""); if (!os) revert ErrWithdrawingETH(); } /** * @notice sends the balance of this contract's `erc20` balance to the owner * @param erc20 - the token address to claim from */ function withdrawERC20(address erc20) external onlyOwner { IERC20 token = IERC20(erc20); token.transfer(msg.sender, token.balanceOf(address(this))); } /* -------------------------------------------------------------------------- */ /* views */ /* -------------------------------------------------------------------------- */ /** * @notice Returns the episodes purchased by the supplied address * @param account The address to check */ function episodesOfOwner(address account) external view returns (uint256[] memory) { uint256[] memory episodes = new uint256[](MAX_EPISODE_ID + 1); uint256 map = episodePurchasedBitmap[account]; uint256 count; assembly { let i := 0 let len := add(MAX_EPISODE_ID, 1) for {} lt(i, len) { i := add(i, 1) } { // Check if the bit is set if gt(and(map, shl(i, 1)), 0) { count := add(count, 1) mstore(add(episodes, mul(count, 0x20)), i) } } } // Resizing the array according to the count assembly { mstore(episodes, count) } return episodes; } function isSeasonPassHolder(address account) external view returns (bool) { return _isSeasonPassHolder(episodePurchasedBitmap[account]); } function _isSeasonPassHolder(uint256 bitmap) internal pure returns (bool) { return (bitmap & OWNS_SEASON_PASS_BITPOS) != 0; } /** * @notice Returns whether an episode has been purchased by the supplied address * @param account The address to check * @param account The episodeId to check * @dev Reverts if an episode does not exist (i.e. > MAX_EPISODE_ID) */ function ownsEpisode(address account, uint256 episodeId) external view returns (bool) { if (episodeId > MAX_EPISODE_ID) { _revert(EpisodeDoesNotExist.selector); } uint256 map = episodePurchasedBitmap[account]; if (_isSeasonPassHolder(map)) { return true; } return (map & (1 << episodeId)) != 0; } /* -------------------------------------------------------------------------- */ /* internal */ /* -------------------------------------------------------------------------- */ function _revert(bytes4 code) internal pure { assembly { mstore(0x0, code) revert(0x0, 0x04) } } /** * @dev Checks whether a signature is valid for discount on purchase * @dev Reverts if now > expirationTimestamp * @dev Reverts if the signature is invalid * @param _discount the discount in basis point (e.g. 500 for 5% discount) * @param _expirationTimestamp the expiration timestamp for which this discount can be applied * @param signature the signature */ function _checkDiscountSignature( uint256[] memory episodeIds, uint256 _discount, uint256 _expirationTimestamp, bytes memory signature ) internal view { bytes32 hash = keccak256( abi.encodePacked( msg.sender, episodeIds, _discount, block.chainid, address(this), _expirationTimestamp, "discount" ) ); if (block.timestamp > _expirationTimestamp) { _revert(VoucherExpired.selector); } if (hash.toEthSignedMessageHash().recover(signature) != signer) { _revert(InvalidSignature.selector); } } /** * @dev Checks whether a signature is valid for price on purchase * @dev Reverts if now > expirationTimestamp * @dev Reverts if the signature is invalid * @param _totalPrice the total price for all the episodes * @param _expirationTimestamp the expiration timestamp for which this discount can be applied * @param signature the signature */ function _checkTotalPriceSignature( uint256[] memory episodeIds, uint256 _totalPrice, uint256 _expirationTimestamp, bytes memory signature ) internal view { bytes32 hash = keccak256( abi.encodePacked( msg.sender, episodeIds, _totalPrice, block.chainid, address(this), _expirationTimestamp, "totalPrice" ) ); if (block.timestamp > _expirationTimestamp) { _revert(VoucherExpired.selector); } if (hash.toEthSignedMessageHash().recover(signature) != signer) { _revert(InvalidSignature.selector); } } /** * @dev Updates episodePurchasedBitmap for a user * @dev Reverts if any of the episodes does not exist * @dev Reverts if any of the episodes has been been purchased * @param user the address to be updated * @param episodeIds the IDs of the purchased episodes */ function _grantEpisodes(address user, uint256[] memory episodeIds) internal { uint256 existingEpisodeBitmap = episodePurchasedBitmap[user]; uint256 newEpisodeBitmap = existingEpisodeBitmap; // loop, check episodeId for (uint256 i; i < episodeIds.length;) { uint256 episodeId = episodeIds[i]; // episode doesn't exist if (episodeId > MAX_EPISODE_ID) { _revert(EpisodeDoesNotExist.selector); } uint256 shiftedEpisodeId = 1 << episodeId; //buying 5 episodes is equivalent to buying the season pass, therefore, the episode CAN be repurchased only in this specific case. if (episodeIds.length != MAX_EPISODE_ID + 1) { // episode already purchased if ((existingEpisodeBitmap & shiftedEpisodeId) != 0) { _revert(EpisodeAlreadyPurchased.selector); } } // update bitmap newEpisodeBitmap |= shiftedEpisodeId; // next loop unchecked { ++i; } } // got all episodes => season pass if (episodeIds.length == MAX_EPISODE_ID + 1) { newEpisodeBitmap |= OWNS_SEASON_PASS_BITPOS; emit SeasonPassPurchased(user); } // update episodePurchasedBitmap[user] = newEpisodeBitmap; emit EpisodesPurchased(user, episodeIds); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol) pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() { _transferOwnership(_msgSender()); } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { _checkOwner(); _; } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if the sender is not the owner. */ function _checkOwner() internal view virtual { require(owner() == _msgSender(), "Ownable: caller is not the owner"); } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _transferOwnership(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/ECDSA.sol) pragma solidity ^0.8.0; import "../Strings.sol"; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. */ library ECDSA { enum RecoverError { NoError, InvalidSignature, InvalidSignatureLength, InvalidSignatureS, InvalidSignatureV // Deprecated in v4.8 } function _throwError(RecoverError error) private pure { if (error == RecoverError.NoError) { return; // no error: do nothing } else if (error == RecoverError.InvalidSignature) { revert("ECDSA: invalid signature"); } else if (error == RecoverError.InvalidSignatureLength) { revert("ECDSA: invalid signature length"); } else if (error == RecoverError.InvalidSignatureS) { revert("ECDSA: invalid signature 's' value"); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature` or error string. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. * * Documentation for signature generation: * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js] * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers] * * _Available since v4.3._ */ function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) { if (signature.length == 65) { bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. /// @solidity memory-safe-assembly assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } return tryRecover(hash, v, r, s); } else { return (address(0), RecoverError.InvalidSignatureLength); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, signature); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately. * * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures] * * _Available since v4.3._ */ function tryRecover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address, RecoverError) { bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff); uint8 v = uint8((uint256(vs) >> 255) + 27); return tryRecover(hash, v, r, s); } /** * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately. * * _Available since v4.2._ */ function recover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, r, vs); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `v`, * `r` and `s` signature fields separately. * * _Available since v4.3._ */ function tryRecover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address, RecoverError) { // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most // signatures from current libraries generate a unique signature with an s-value in the lower half order. // // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept // these malleable signatures as well. if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) { return (address(0), RecoverError.InvalidSignatureS); } // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(hash, v, r, s); if (signer == address(0)) { return (address(0), RecoverError.InvalidSignature); } return (signer, RecoverError.NoError); } /** * @dev Overload of {ECDSA-recover} that receives the `v`, * `r` and `s` signature fields separately. */ function recover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, v, r, s); _throwError(error); return recovered; } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) { // 32 is the length in bytes of hash, // enforced by the type signature above return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); } /** * @dev Returns an Ethereum Signed Message, created from `s`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s)); } /** * @dev Returns an Ethereum Signed Typed Data, created from a * `domainSeparator` and a `structHash`. This produces hash corresponding * to the one signed with the * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] * JSON-RPC method as part of EIP-712. * * See {recover}. */ function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash)); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `from` to `to` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 amount ) external returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Context.sol) pragma solidity ^0.8.0; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol) pragma solidity ^0.8.0; import "./math/Math.sol"; /** * @dev String operations. */ library Strings { bytes16 private constant _SYMBOLS = "0123456789abcdef"; uint8 private constant _ADDRESS_LENGTH = 20; /** * @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. */ function toHexString(uint256 value) internal pure returns (string memory) { unchecked { return toHexString(value, Math.log256(value) + 1); } } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { 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[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); 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); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol) pragma solidity ^0.8.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { enum Rounding { Down, // Toward negative infinity Up, // Toward infinity Zero // Toward zero } /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a > b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow. return (a & b) + (a ^ b) / 2; } /** * @dev Returns the ceiling of the division of two numbers. * * This differs from standard division with `/` in that it rounds up instead * of rounding down. */ function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b - 1) / b can overflow on addition, so we distribute. return a == 0 ? 0 : (a - 1) / b + 1; } /** * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0 * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) * with further edits by Uniswap Labs also under MIT license. */ function mulDiv( uint256 x, uint256 y, uint256 denominator ) internal pure returns (uint256 result) { unchecked { // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256 // variables such that product = prod1 * 2^256 + prod0. uint256 prod0; // Least significant 256 bits of the product uint256 prod1; // Most significant 256 bits of the product assembly { let mm := mulmod(x, y, not(0)) prod0 := mul(x, y) prod1 := sub(sub(mm, prod0), lt(mm, prod0)) } // Handle non-overflow cases, 256 by 256 division. if (prod1 == 0) { return prod0 / denominator; } // Make sure the result is less than 2^256. Also prevents denominator == 0. require(denominator > prod1); /////////////////////////////////////////////// // 512 by 256 division. /////////////////////////////////////////////// // Make division exact by subtracting the remainder from [prod1 prod0]. uint256 remainder; assembly { // Compute remainder using mulmod. remainder := mulmod(x, y, denominator) // Subtract 256 bit number from 512 bit number. prod1 := sub(prod1, gt(remainder, prod0)) prod0 := sub(prod0, remainder) } // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1. // See https://cs.stackexchange.com/q/138556/92363. // Does not overflow because the denominator cannot be zero at this stage in the function. uint256 twos = denominator & (~denominator + 1); assembly { // Divide denominator by twos. denominator := div(denominator, twos) // Divide [prod1 prod0] by twos. prod0 := div(prod0, twos) // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one. twos := add(div(sub(0, twos), twos), 1) } // Shift in bits from prod1 into prod0. prod0 |= prod1 * twos; // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for // four bits. That is, denominator * inv = 1 mod 2^4. uint256 inverse = (3 * denominator) ^ 2; // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works // in modular arithmetic, doubling the correct bits in each step. inverse *= 2 - denominator * inverse; // inverse mod 2^8 inverse *= 2 - denominator * inverse; // inverse mod 2^16 inverse *= 2 - denominator * inverse; // inverse mod 2^32 inverse *= 2 - denominator * inverse; // inverse mod 2^64 inverse *= 2 - denominator * inverse; // inverse mod 2^128 inverse *= 2 - denominator * inverse; // inverse mod 2^256 // Because the division is now exact we can divide by multiplying with the modular inverse of denominator. // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1 // is no longer required. result = prod0 * inverse; return result; } } /** * @notice Calculates x * y / denominator with full precision, following the selected rounding direction. */ function mulDiv( uint256 x, uint256 y, uint256 denominator, Rounding rounding ) internal pure returns (uint256) { uint256 result = mulDiv(x, y, denominator); if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) { result += 1; } return result; } /** * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down. * * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11). */ function sqrt(uint256 a) internal pure returns (uint256) { if (a == 0) { return 0; } // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target. // // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`. // // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)` // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))` // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)` // // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit. uint256 result = 1 << (log2(a) >> 1); // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128, // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision // into the expected uint128 result. unchecked { result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; return min(result, a / result); } } /** * @notice Calculates sqrt(a), following the selected rounding direction. */ function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = sqrt(a); return result + (rounding == Rounding.Up && result * result < a ? 1 : 0); } } /** * @dev Return the log in base 2, rounded down, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 128; } if (value >> 64 > 0) { value >>= 64; result += 64; } if (value >> 32 > 0) { value >>= 32; result += 32; } if (value >> 16 > 0) { value >>= 16; result += 16; } if (value >> 8 > 0) { value >>= 8; result += 8; } if (value >> 4 > 0) { value >>= 4; result += 4; } if (value >> 2 > 0) { value >>= 2; result += 2; } if (value >> 1 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 2, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log2(value); return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0); } } /** * @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 Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log10(value); return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0); } } /** * @dev Return the log in base 256, rounded down, of a positive value. * Returns 0 if given 0. * * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string. */ function log256(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 16; } if (value >> 64 > 0) { value >>= 64; result += 8; } if (value >> 32 > 0) { value >>= 32; result += 4; } if (value >> 16 > 0) { value >>= 16; result += 2; } if (value >> 8 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log256(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log256(value); return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0); } } }
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Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
[{"inputs":[{"internalType":"address","name":"_helloToken","type":"address"},{"internalType":"address","name":"_signer","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"ErrWithdrawingETH","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256[]","name":"episode","type":"uint256[]"}],"name":"EpisodesPurchased","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"pricePerEpisode","type":"uint256"}],"name":"PricePerEpisodeChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"}],"name":"SeasonPassPurchased","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"signer","type":"address"}],"name":"SignerChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bool","name":"signerOnly","type":"bool"}],"name":"SignerOnlyChanged","type":"event"},{"inputs":[],"name":"HELLO_TOKEN","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"episodePurchasedBitmap","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"episodesOfOwner","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"isSeasonPassHolder","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"episodeId","type":"uint256"}],"name":"ownsEpisode","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pricePerEpisode","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"episodeIds","type":"uint256[]"},{"internalType":"uint256","name":"_discount","type":"uint256"},{"internalType":"uint256","name":"_expirationTimestamp","type":"uint256"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"purchaseEpisodeWithDiscount","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"episodeIds","type":"uint256[]"}],"name":"purchaseEpisodesNoDiscount","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"episodeIds","type":"uint256[]"},{"internalType":"uint256","name":"totalPrice","type":"uint256"},{"internalType":"uint256","name":"_expirationTimestamp","type":"uint256"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"purchaseEpisodesSignatureOnly","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_price","type":"uint256"}],"name":"setPricePerEpisode","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_signer","type":"address"}],"name":"setSigner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"_signerOnly","type":"bool"}],"name":"setSignerOnly","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"signer","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"signerOnly","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"erc20","type":"address"}],"name":"withdrawERC20","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawETH","outputs":[],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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Deployed Bytecode
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000411099c0b413f4feddb10edf6a8be63bd321311c000000000000000000000000b2f8c66fa3589167d1601b97b6ebce245155140d
-----Decoded View---------------
Arg [0] : _helloToken (address): 0x411099C0b413f4fedDb10Edf6a8be63BD321311C
Arg [1] : _signer (address): 0xb2F8C66Fa3589167D1601b97B6ebCe245155140d
-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000411099c0b413f4feddb10edf6a8be63bd321311c
Arg [1] : 000000000000000000000000b2f8c66fa3589167d1601b97b6ebce245155140d
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.