Overview
ETH Balance
0.53471482186678617 ETH
Eth Value
$1,632.75 (@ $3,053.50/ETH)More Info
Private Name Tags
ContractCreator
Latest 25 from a total of 5,820 transactions
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Player Roll Dice | 6347494 | 2119 days ago | IN | 0.1 ETH | 0.000175 | ||||
Player Roll Dice | 6347470 | 2119 days ago | IN | 0.1 ETH | 0.000175 | ||||
Place Bet | 6294356 | 2128 days ago | IN | 0.15 ETH | 0.00030857 | ||||
Place Bet | 6290265 | 2129 days ago | IN | 1.8 ETH | 0.00025714 | ||||
Place Bet | 6289959 | 2129 days ago | IN | 0.1 ETH | 0.00029519 | ||||
Place Bet | 6289956 | 2129 days ago | IN | 0.1 ETH | 0.00030994 | ||||
Place Bet | 6289040 | 2129 days ago | IN | 0.05 ETH | 0.00034286 | ||||
Place Bet | 6287935 | 2129 days ago | IN | 0.1 ETH | 0.0003489 | ||||
Place Bet | 6287857 | 2129 days ago | IN | 0.03 ETH | 0.0003839 | ||||
Place Bet | 6287852 | 2129 days ago | IN | 0.03 ETH | 0.0005235 | ||||
Place Bet | 6287821 | 2129 days ago | IN | 0.04 ETH | 0.00052254 | ||||
Place Bet | 6287815 | 2129 days ago | IN | 0.03 ETH | 0.0005235 | ||||
Place Bet | 6287432 | 2129 days ago | IN | 0.01 ETH | 0.00031356 | ||||
Refund Bet | 6287358 | 2129 days ago | IN | 0 ETH | 0.00029883 | ||||
Set Max Profit | 6287254 | 2129 days ago | IN | 0 ETH | 0.00014954 | ||||
Place Bet | 6287193 | 2129 days ago | IN | 0.05 ETH | 0.00036967 | ||||
Place Bet | 6287181 | 2129 days ago | IN | 0.05 ETH | 0.00036967 | ||||
Place Bet | 6287169 | 2129 days ago | IN | 0.1 ETH | 0.00061117 | ||||
Place Bet | 6287163 | 2129 days ago | IN | 0.1 ETH | 0.0003667 | ||||
Place Bet | 6287156 | 2129 days ago | IN | 0.02 ETH | 0.00036741 | ||||
Place Bet | 6287023 | 2129 days ago | IN | 0.04 ETH | 0.00036737 | ||||
Place Bet | 6286983 | 2129 days ago | IN | 0.01 ETH | 0.00036741 | ||||
Place Bet | 6286978 | 2129 days ago | IN | 0.01 ETH | 0.00020412 | ||||
Place Bet | 6286972 | 2129 days ago | IN | 0.01 ETH | 0.00020412 | ||||
Place Bet | 6286964 | 2129 days ago | IN | 0.01 ETH | 0.00036972 |
Latest 25 internal transactions (View All)
Advanced mode:
Parent Transaction Hash | Block | From | To | Value | ||
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6287358 | 2129 days ago | 0.1 ETH | ||||
6286854 | 2129 days ago | 0.01164 ETH | ||||
6286141 | 2129 days ago | 0.01164 ETH | ||||
6285872 | 2129 days ago | 0.01 ETH | ||||
6285314 | 2130 days ago | 0.099 ETH | ||||
6285310 | 2130 days ago | 1 wei | ||||
6285305 | 2130 days ago | 0.099 ETH | ||||
6285301 | 2130 days ago | 1 wei | ||||
6285300 | 2130 days ago | 0.099 ETH | ||||
6285298 | 2130 days ago | 1 wei | ||||
6285242 | 2130 days ago | 1 wei | ||||
6285239 | 2130 days ago | 0.2364 ETH | ||||
6285237 | 2130 days ago | 0.1182 ETH | ||||
6285225 | 2130 days ago | 1 wei | ||||
6285222 | 2130 days ago | 1 wei | ||||
6285222 | 2130 days ago | 0.2364 ETH | ||||
6285217 | 2130 days ago | 0.0194 ETH | ||||
6285213 | 2130 days ago | 3.958 ETH | ||||
6285213 | 2130 days ago | 2 ETH | ||||
6285212 | 2130 days ago | 0.0394 ETH | ||||
6285212 | 2130 days ago | 0.0792 ETH | ||||
6285211 | 2130 days ago | 3.958 ETH | ||||
6285211 | 2130 days ago | 2 ETH | ||||
6285209 | 2130 days ago | 3.958 ETH | ||||
6285209 | 2130 days ago | 2 ETH |
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Contract Name:
Dice2Win
Compiler Version
v0.4.24+commit.e67f0147
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2018-09-05 */ pragma solidity ^0.4.24; // * dice2.win - fair games that pay Ether. Version 4. // // * Ethereum smart contract, deployed at 0xD1CEeeeee8aF2791fC928beFfB0FFaC3387850DE. // // * Uses hybrid commit-reveal + block hash random number generation that is immune // to tampering by players, house and miners. Apart from being fully transparent, // this also allows arbitrarily high bets. // // * Refer to https://dice2.win/whitepaper.pdf for detailed description and proofs. contract Dice2Win { /// *** Constants section // Each bet is deducted 1% in favour of the house, but no less than some minimum. // The lower bound is dictated by gas costs of the settleBet transaction, providing // headroom for up to 10 Gwei prices. uint constant HOUSE_EDGE_PERCENT = 1; uint constant HOUSE_EDGE_MINIMUM_AMOUNT = 0.0003 ether; // Bets lower than this amount do not participate in jackpot rolls (and are // not deducted JACKPOT_FEE). uint constant MIN_JACKPOT_BET = 0.1 ether; // Chance to win jackpot (currently 0.1%) and fee deducted into jackpot fund. uint constant JACKPOT_MODULO = 1000; uint constant JACKPOT_FEE = 0.001 ether; // There is minimum and maximum bets. uint constant MIN_BET = 0.01 ether; uint constant MAX_AMOUNT = 300000 ether; // Modulo is a number of equiprobable outcomes in a game: // - 2 for coin flip // - 6 for dice // - 6*6 = 36 for double dice // - 100 for etheroll // - 37 for roulette // etc. // It's called so because 256-bit entropy is treated like a huge integer and // the remainder of its division by modulo is considered bet outcome. uint constant MAX_MODULO = 100; // For modulos below this threshold rolls are checked against a bit mask, // thus allowing betting on any combination of outcomes. For example, given // modulo 6 for dice, 101000 mask (base-2, big endian) means betting on // 4 and 6; for games with modulos higher than threshold (Etheroll), a simple // limit is used, allowing betting on any outcome in [0, N) range. // // The specific value is dictated by the fact that 256-bit intermediate // multiplication result allows implementing population count efficiently // for numbers that are up to 42 bits, and 40 is the highest multiple of // eight below 42. uint constant MAX_MASK_MODULO = 40; // This is a check on bet mask overflow. uint constant MAX_BET_MASK = 2 ** MAX_MASK_MODULO; // EVM BLOCKHASH opcode can query no further than 256 blocks into the // past. Given that settleBet uses block hash of placeBet as one of // complementary entropy sources, we cannot process bets older than this // threshold. On rare occasions dice2.win croupier may fail to invoke // settleBet in this timespan due to technical issues or extreme Ethereum // congestion; such bets can be refunded via invoking refundBet. uint constant BET_EXPIRATION_BLOCKS = 250; // Some deliberately invalid address to initialize the secret signer with. // Forces maintainers to invoke setSecretSigner before processing any bets. address constant DUMMY_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE; // Standard contract ownership transfer. address public owner; address private nextOwner; // Adjustable max bet profit. Used to cap bets against dynamic odds. uint public maxProfit; // The address corresponding to a private key used to sign placeBet commits. address public secretSigner; // Accumulated jackpot fund. uint128 public jackpotSize; // Funds that are locked in potentially winning bets. Prevents contract from // committing to bets it cannot pay out. uint128 public lockedInBets; // A structure representing a single bet. struct Bet { // Wager amount in wei. uint amount; // Modulo of a game. uint8 modulo; // Number of winning outcomes, used to compute winning payment (* modulo/rollUnder), // and used instead of mask for games with modulo > MAX_MASK_MODULO. uint8 rollUnder; // Block number of placeBet tx. uint40 placeBlockNumber; // Bit mask representing winning bet outcomes (see MAX_MASK_MODULO comment). uint40 mask; // Address of a gambler, used to pay out winning bets. address gambler; } // Mapping from commits to all currently active & processed bets. mapping (uint => Bet) bets; // Events that are issued to make statistic recovery easier. event FailedPayment(address indexed beneficiary, uint amount); event Payment(address indexed beneficiary, uint amount); event JackpotPayment(address indexed beneficiary, uint amount); // This event is emitted in placeBet to record commit in the logs. event Commit(uint commit); // Constructor. Deliberately does not take any parameters. constructor () public { owner = msg.sender; secretSigner = DUMMY_ADDRESS; } // Standard modifier on methods invokable only by contract owner. modifier onlyOwner { require (msg.sender == owner, "OnlyOwner methods called by non-owner."); _; } // Standard contract ownership transfer implementation, function approveNextOwner(address _nextOwner) external onlyOwner { require (_nextOwner != owner, "Cannot approve current owner."); nextOwner = _nextOwner; } function acceptNextOwner() external { require (msg.sender == nextOwner, "Can only accept preapproved new owner."); owner = nextOwner; } // Fallback function deliberately left empty. It's primary use case // is to top up the bank roll. function () public payable { } // See comment for "secretSigner" variable. function setSecretSigner(address newSecretSigner) external onlyOwner { secretSigner = newSecretSigner; } // Change max bet reward. Setting this to zero effectively disables betting. function setMaxProfit(uint _maxProfit) public onlyOwner { require (_maxProfit < MAX_AMOUNT, "maxProfit should be a sane number."); maxProfit = _maxProfit; } // This function is used to bump up the jackpot fund. Cannot be used to lower it. function increaseJackpot(uint increaseAmount) external onlyOwner { require (increaseAmount <= address(this).balance, "Increase amount larger than balance."); require (jackpotSize + lockedInBets + increaseAmount <= address(this).balance, "Not enough funds."); jackpotSize += uint128(increaseAmount); } // Funds withdrawal to cover costs of dice2.win operation. function withdrawFunds(address beneficiary, uint withdrawAmount) external onlyOwner { require (withdrawAmount <= address(this).balance, "Increase amount larger than balance."); require (jackpotSize + lockedInBets + withdrawAmount <= address(this).balance, "Not enough funds."); sendFunds(beneficiary, withdrawAmount, withdrawAmount); } // Contract may be destroyed only when there are no ongoing bets, // either settled or refunded. All funds are transferred to contract owner. function kill() external onlyOwner { require (lockedInBets == 0, "All bets should be processed (settled or refunded) before self-destruct."); selfdestruct(owner); } /// *** Betting logic // Bet states: // amount == 0 && gambler == 0 - 'clean' (can place a bet) // amount != 0 && gambler != 0 - 'active' (can be settled or refunded) // amount == 0 && gambler != 0 - 'processed' (can clean storage) // // NOTE: Storage cleaning is not implemented in this contract version; it will be added // with the next upgrade to prevent polluting Ethereum state with expired bets. // Bet placing transaction - issued by the player. // betMask - bet outcomes bit mask for modulo <= MAX_MASK_MODULO, // [0, betMask) for larger modulos. // modulo - game modulo. // commitLastBlock - number of the maximum block where "commit" is still considered valid. // commit - Keccak256 hash of some secret "reveal" random number, to be supplied // by the dice2.win croupier bot in the settleBet transaction. Supplying // "commit" ensures that "reveal" cannot be changed behind the scenes // after placeBet have been mined. // r, s - components of ECDSA signature of (commitLastBlock, commit). v is // guaranteed to always equal 27. // // Commit, being essentially random 256-bit number, is used as a unique bet identifier in // the 'bets' mapping. // // Commits are signed with a block limit to ensure that they are used at most once - otherwise // it would be possible for a miner to place a bet with a known commit/reveal pair and tamper // with the blockhash. Croupier guarantees that commitLastBlock will always be not greater than // placeBet block number plus BET_EXPIRATION_BLOCKS. See whitepaper for details. function placeBet(uint betMask, uint modulo, uint commitLastBlock, uint commit, bytes32 r, bytes32 s) external payable { // Check that the bet is in 'clean' state. Bet storage bet = bets[commit]; require (bet.gambler == address(0), "Bet should be in a 'clean' state."); // Validate input data ranges. uint amount = msg.value; require (modulo > 1 && modulo <= MAX_MODULO, "Modulo should be within range."); require (amount >= MIN_BET && amount <= MAX_AMOUNT, "Amount should be within range."); require (betMask > 0 && betMask < MAX_BET_MASK, "Mask should be within range."); // Check that commit is valid - it has not expired and its signature is valid. require (block.number <= commitLastBlock, "Commit has expired."); bytes32 signatureHash = keccak256(abi.encodePacked(uint40(commitLastBlock), commit)); require (secretSigner == ecrecover(signatureHash, 27, r, s), "ECDSA signature is not valid."); uint rollUnder; uint mask; if (modulo <= MAX_MASK_MODULO) { // Small modulo games specify bet outcomes via bit mask. // rollUnder is a number of 1 bits in this mask (population count). // This magic looking formula is an efficient way to compute population // count on EVM for numbers below 2**40. For detailed proof consult // the dice2.win whitepaper. rollUnder = ((betMask * POPCNT_MULT) & POPCNT_MASK) % POPCNT_MODULO; mask = betMask; } else { // Larger modulos specify the right edge of half-open interval of // winning bet outcomes. require (betMask > 0 && betMask <= modulo, "High modulo range, betMask larger than modulo."); rollUnder = betMask; } // Winning amount and jackpot increase. uint possibleWinAmount; uint jackpotFee; (possibleWinAmount, jackpotFee) = getDiceWinAmount(amount, modulo, rollUnder); // Enforce max profit limit. require (possibleWinAmount <= amount + maxProfit, "maxProfit limit violation."); // Lock funds. lockedInBets += uint128(possibleWinAmount); jackpotSize += uint128(jackpotFee); // Check whether contract has enough funds to process this bet. require (jackpotSize + lockedInBets <= address(this).balance, "Cannot afford to lose this bet."); // Record commit in logs. emit Commit(commit); // Store bet parameters on blockchain. bet.amount = amount; bet.modulo = uint8(modulo); bet.rollUnder = uint8(rollUnder); bet.placeBlockNumber = uint40(block.number); bet.mask = uint40(mask); bet.gambler = msg.sender; } // Settlement transaction - can in theory be issued by anyone, but is designed to be // handled by the dice2.win croupier bot. To settle a bet with a specific "commit", // settleBet should supply a "reveal" number that would Keccak256-hash to // "commit". "blockHash" is the block hash of placeBet block as seen by croupier; it // is additionally asserted to prevent changing the bet outcomes on Ethereum reorgs. function settleBet(uint reveal, bytes32 blockHash) external { uint commit = uint(keccak256(abi.encodePacked(reveal))); Bet storage bet = bets[commit]; uint placeBlockNumber = bet.placeBlockNumber; // Check that bet has not expired yet (see comment to BET_EXPIRATION_BLOCKS). require (block.number > placeBlockNumber, "settleBet in the same block as placeBet, or before."); require (block.number <= placeBlockNumber + BET_EXPIRATION_BLOCKS, "Blockhash can't be queried by EVM."); require (blockhash(placeBlockNumber) == blockHash); // Settle bet using reveal and blockHash as entropy sources. settleBetCommon(bet, reveal, blockHash); } // This method is used to settle a bet that was mined into an uncle block. At this // point the player was shown some bet outcome, but the blockhash at placeBet height // is different because of Ethereum chain reorg. We supply a full merkle proof of the // placeBet transaction receipt to provide untamperable evidence that uncle block hash // indeed was present on-chain at some point. function settleBetUncleMerkleProof(uint reveal, uint40 canonicalBlockNumber) external { // "commit" for bet settlement can only be obtained by hashing a "reveal". uint commit = uint(keccak256(abi.encodePacked(reveal))); Bet storage bet = bets[commit]; // Check that canonical block hash can still be verified. require (block.number <= canonicalBlockNumber + BET_EXPIRATION_BLOCKS, "Blockhash can't be queried by EVM."); // Verify placeBet receipt. requireCorrectReceipt(4 + 32 + 32 + 4); // Reconstruct canonical & uncle block hashes from a receipt merkle proof, verify them. bytes32 canonicalHash; bytes32 uncleHash; (canonicalHash, uncleHash) = verifyMerkleProof(commit, 4 + 32 + 32); require (blockhash(canonicalBlockNumber) == canonicalHash); // Settle bet using reveal and uncleHash as entropy sources. settleBetCommon(bet, reveal, uncleHash); } // Common settlement code for settleBet & settleBetUncleMerkleProof. function settleBetCommon(Bet storage bet, uint reveal, bytes32 entropyBlockHash) private { // Fetch bet parameters into local variables (to save gas). uint amount = bet.amount; uint modulo = bet.modulo; uint rollUnder = bet.rollUnder; address gambler = bet.gambler; // Check that bet is in 'active' state. require (amount != 0, "Bet should be in an 'active' state"); // Move bet into 'processed' state already. bet.amount = 0; // The RNG - combine "reveal" and blockhash of placeBet using Keccak256. Miners // are not aware of "reveal" and cannot deduce it from "commit" (as Keccak256 // preimage is intractable), and house is unable to alter the "reveal" after // placeBet have been mined (as Keccak256 collision finding is also intractable). bytes32 entropy = keccak256(abi.encodePacked(reveal, entropyBlockHash)); // Do a roll by taking a modulo of entropy. Compute winning amount. uint dice = uint(entropy) % modulo; uint diceWinAmount; uint _jackpotFee; (diceWinAmount, _jackpotFee) = getDiceWinAmount(amount, modulo, rollUnder); uint diceWin = 0; uint jackpotWin = 0; // Determine dice outcome. if (modulo <= MAX_MASK_MODULO) { // For small modulo games, check the outcome against a bit mask. if ((2 ** dice) & bet.mask != 0) { diceWin = diceWinAmount; } } else { // For larger modulos, check inclusion into half-open interval. if (dice < rollUnder) { diceWin = diceWinAmount; } } // Unlock the bet amount, regardless of the outcome. lockedInBets -= uint128(diceWinAmount); // Roll for a jackpot (if eligible). if (amount >= MIN_JACKPOT_BET) { // The second modulo, statistically independent from the "main" dice roll. // Effectively you are playing two games at once! uint jackpotRng = (uint(entropy) / modulo) % JACKPOT_MODULO; // Bingo! if (jackpotRng == 0) { jackpotWin = jackpotSize; jackpotSize = 0; } } // Log jackpot win. if (jackpotWin > 0) { emit JackpotPayment(gambler, jackpotWin); } // Send the funds to gambler. sendFunds(gambler, diceWin + jackpotWin == 0 ? 1 wei : diceWin + jackpotWin, diceWin); } // Refund transaction - return the bet amount of a roll that was not processed in a // due timeframe. Processing such blocks is not possible due to EVM limitations (see // BET_EXPIRATION_BLOCKS comment above for details). In case you ever find yourself // in a situation like this, just contact the dice2.win support, however nothing // precludes you from invoking this method yourself. function refundBet(uint commit) external { // Check that bet is in 'active' state. Bet storage bet = bets[commit]; uint amount = bet.amount; require (amount != 0, "Bet should be in an 'active' state"); // Check that bet has already expired. require (block.number > bet.placeBlockNumber + BET_EXPIRATION_BLOCKS, "Blockhash can't be queried by EVM."); // Move bet into 'processed' state, release funds. bet.amount = 0; uint diceWinAmount; uint jackpotFee; (diceWinAmount, jackpotFee) = getDiceWinAmount(amount, bet.modulo, bet.rollUnder); lockedInBets -= uint128(diceWinAmount); jackpotSize -= uint128(jackpotFee); // Send the refund. sendFunds(bet.gambler, amount, amount); } // Get the expected win amount after house edge is subtracted. function getDiceWinAmount(uint amount, uint modulo, uint rollUnder) private pure returns (uint winAmount, uint jackpotFee) { require (0 < rollUnder && rollUnder <= modulo, "Win probability out of range."); jackpotFee = amount >= MIN_JACKPOT_BET ? JACKPOT_FEE : 0; uint houseEdge = amount * HOUSE_EDGE_PERCENT / 100; if (houseEdge < HOUSE_EDGE_MINIMUM_AMOUNT) { houseEdge = HOUSE_EDGE_MINIMUM_AMOUNT; } require (houseEdge + jackpotFee <= amount, "Bet doesn't even cover house edge."); winAmount = (amount - houseEdge - jackpotFee) * modulo / rollUnder; } // Helper routine to process the payment. function sendFunds(address beneficiary, uint amount, uint successLogAmount) private { if (beneficiary.send(amount)) { emit Payment(beneficiary, successLogAmount); } else { emit FailedPayment(beneficiary, amount); } } // This are some constants making O(1) population count in placeBet possible. // See whitepaper for intuition and proofs behind it. uint constant POPCNT_MULT = 0x0000000000002000000000100000000008000000000400000000020000000001; uint constant POPCNT_MASK = 0x0001041041041041041041041041041041041041041041041041041041041041; uint constant POPCNT_MODULO = 0x3F; // *** Merkle proofs. // This helpers are used to verify cryptographic proofs of placeBet inclusion into // uncle blocks. They are used to prevent bet outcome changing on Ethereum reorgs without // compromising the security of the smart contract. Proof data is appended to the input data // in a simple prefix length format and does not adhere to the ABI. // Invariants checked: // - receipt trie entry contains a (1) successful transaction (2) directed at this smart // contract (3) containing commit as a payload. // - receipt trie entry is a part of a valid merkle proof of a block header // - the block header is a part of uncle list of some block on canonical chain // The implementation is optimized for gas cost and relies on the specifics of Ethereum internal data structures. // Read the whitepaper for details. // Helper to verify a full merkle proof starting from some seedHash (usually commit). "offset" is the location of the proof // beginning in the calldata. function verifyMerkleProof(uint seedHash, uint offset) pure private returns (bytes32 blockHash, bytes32 uncleHash) { // (Safe) assumption - nobody will write into RAM during this method invocation. uint scratchBuf1; assembly { scratchBuf1 := mload(0x40) } uint uncleHeaderLength; uint blobLength; uint shift; uint hashSlot; // Verify merkle proofs up to uncle block header. Calldata layout is: // - 2 byte big-endian slice length // - 2 byte big-endian offset to the beginning of previous slice hash within the current slice (should be zeroed) // - followed by the current slice verbatim for (;; offset += blobLength) { assembly { blobLength := and(calldataload(sub(offset, 30)), 0xffff) } if (blobLength == 0) { // Zero slice length marks the end of uncle proof. break; } assembly { shift := and(calldataload(sub(offset, 28)), 0xffff) } require (shift < blobLength, "Shift bounds check."); offset += 4; assembly { hashSlot := calldataload(add(offset, shift)) } require (hashSlot == 0, "Non-empty hash slot."); assembly { calldatacopy(scratchBuf1, offset, blobLength) mstore(add(scratchBuf1, shift), seedHash) seedHash := sha3(scratchBuf1, blobLength) uncleHeaderLength := blobLength } } // At this moment the uncle hash is known. uncleHash = bytes32(seedHash); // Construct the uncle list of a canonical block. uint scratchBuf2 = scratchBuf1 + uncleHeaderLength; uint unclesLength; assembly { unclesLength := and(calldataload(sub(offset, 28)), 0xffff) } uint unclesShift; assembly { unclesShift := and(calldataload(sub(offset, 26)), 0xffff) } require (unclesShift < unclesLength, "Shift bounds check."); offset += 6; assembly { calldatacopy(scratchBuf2, offset, unclesLength) } memcpy(scratchBuf2 + unclesShift, scratchBuf1, uncleHeaderLength); assembly { seedHash := sha3(scratchBuf2, unclesLength) } offset += unclesLength; // Verify the canonical block header using the computed sha3Uncles. assembly { blobLength := and(calldataload(sub(offset, 30)), 0xffff) shift := and(calldataload(sub(offset, 28)), 0xffff) } require (shift < blobLength, "Shift bounds check."); offset += 4; assembly { hashSlot := calldataload(add(offset, shift)) } require (hashSlot == 0, "Non-empty hash slot."); assembly { calldatacopy(scratchBuf1, offset, blobLength) mstore(add(scratchBuf1, shift), seedHash) // At this moment the canonical block hash is known. blockHash := sha3(scratchBuf1, blobLength) } } // Helper to check the placeBet receipt. "offset" is the location of the proof beginning in the calldata. // RLP layout: [triePath, str([status, cumGasUsed, bloomFilter, [[address, [topics], data]])] function requireCorrectReceipt(uint offset) view private { uint leafHeaderByte; assembly { leafHeaderByte := byte(0, calldataload(offset)) } require (leafHeaderByte >= 0xf7, "Receipt leaf longer than 55 bytes."); offset += leafHeaderByte - 0xf6; uint pathHeaderByte; assembly { pathHeaderByte := byte(0, calldataload(offset)) } if (pathHeaderByte <= 0x7f) { offset += 1; } else { require (pathHeaderByte >= 0x80 && pathHeaderByte <= 0xb7, "Path is an RLP string."); offset += pathHeaderByte - 0x7f; } uint receiptStringHeaderByte; assembly { receiptStringHeaderByte := byte(0, calldataload(offset)) } require (receiptStringHeaderByte == 0xb9, "Receipt string is always at least 256 bytes long, but less than 64k."); offset += 3; uint receiptHeaderByte; assembly { receiptHeaderByte := byte(0, calldataload(offset)) } require (receiptHeaderByte == 0xf9, "Receipt is always at least 256 bytes long, but less than 64k."); offset += 3; uint statusByte; assembly { statusByte := byte(0, calldataload(offset)) } require (statusByte == 0x1, "Status should be success."); offset += 1; uint cumGasHeaderByte; assembly { cumGasHeaderByte := byte(0, calldataload(offset)) } if (cumGasHeaderByte <= 0x7f) { offset += 1; } else { require (cumGasHeaderByte >= 0x80 && cumGasHeaderByte <= 0xb7, "Cumulative gas is an RLP string."); offset += cumGasHeaderByte - 0x7f; } uint bloomHeaderByte; assembly { bloomHeaderByte := byte(0, calldataload(offset)) } require (bloomHeaderByte == 0xb9, "Bloom filter is always 256 bytes long."); offset += 256 + 3; uint logsListHeaderByte; assembly { logsListHeaderByte := byte(0, calldataload(offset)) } require (logsListHeaderByte == 0xf8, "Logs list is less than 256 bytes long."); offset += 2; uint logEntryHeaderByte; assembly { logEntryHeaderByte := byte(0, calldataload(offset)) } require (logEntryHeaderByte == 0xf8, "Log entry is less than 256 bytes long."); offset += 2; uint addressHeaderByte; assembly { addressHeaderByte := byte(0, calldataload(offset)) } require (addressHeaderByte == 0x94, "Address is 20 bytes long."); uint logAddress; assembly { logAddress := and(calldataload(sub(offset, 11)), 0xffffffffffffffffffffffffffffffffffffffff) } require (logAddress == uint(address(this))); } // Memory copy. function memcpy(uint dest, uint src, uint len) pure private { // Full 32 byte words for(; len >= 32; len -= 32) { assembly { mstore(dest, mload(src)) } dest += 32; src += 32; } // Remaining bytes uint mask = 256 ** (32 - len) - 1; assembly { let srcpart := and(mload(src), not(mask)) let destpart := and(mload(dest), mask) mstore(dest, or(destpart, srcpart)) } } }
Contract Security Audit
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[{"constant":false,"inputs":[],"name":"kill","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"secretSigner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"jackpotSize","outputs":[{"name":"","type":"uint128"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"betMask","type":"uint256"},{"name":"modulo","type":"uint256"},{"name":"commitLastBlock","type":"uint256"},{"name":"commit","type":"uint256"},{"name":"r","type":"bytes32"},{"name":"s","type":"bytes32"}],"name":"placeBet","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[{"name":"reveal","type":"uint256"},{"name":"canonicalBlockNumber","type":"uint40"}],"name":"settleBetUncleMerkleProof","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"maxProfit","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"beneficiary","type":"address"},{"name":"withdrawAmount","type":"uint256"}],"name":"withdrawFunds","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"reveal","type":"uint256"},{"name":"blockHash","type":"bytes32"}],"name":"settleBet","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"acceptNextOwner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_nextOwner","type":"address"}],"name":"approveNextOwner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"increaseAmount","type":"uint256"}],"name":"increaseJackpot","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newSecretSigner","type":"address"}],"name":"setSecretSigner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"lockedInBets","outputs":[{"name":"","type":"uint128"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"commit","type":"uint256"}],"name":"refundBet","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_maxProfit","type":"uint256"}],"name":"setMaxProfit","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"beneficiary","type":"address"},{"indexed":false,"name":"amount","type":"uint256"}],"name":"FailedPayment","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"beneficiary","type":"address"},{"indexed":false,"name":"amount","type":"uint256"}],"name":"Payment","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"beneficiary","type":"address"},{"indexed":false,"name":"amount","type":"uint256"}],"name":"JackpotPayment","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"commit","type":"uint256"}],"name":"Commit","type":"event"}]
Contract Creation Code
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Swarm Source
bzzr://91e446bfc37a924fec3e1ffebf2a14c434cd43c375f22ebf383f922f1983617a
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Multichain Portfolio | 26 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
---|---|---|---|---|---|
ETH | Ether (ETH) | 100.00% | $3,053.56 | 0.5347 | $1,632.79 |
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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.