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Escrow CashScript Contract for blind escrow based on local.bitcoin.com
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contract Escrow( | |
bytes20 sellerPHK, // Hash160 of seller's public key | |
bytes20 buyerPKH, // Hash160 of buyer's public key | |
bytes20 arbitratorPKH, // Hash160 of arbitrator's public key | |
bytes escrowKey // Nonce (just some unimportant random bytes unique per exchange) | |
) { | |
function spend( | |
sig spenderSig, | |
pubkey spenderPK, | |
datasig oracleSig, | |
pubkey oraclePK, | |
int actionByte | |
) { | |
bytes20 verifySpenderPKH = bytes20(0); | |
bytes20 verifyOraclePKH = bytes20(0); | |
if (actionByte == 1) { | |
// "releaseBySeller" | |
verifySpenderPKH = buyerPKH; | |
verifyOraclePKH = sellerPHK; | |
} else if (actionByte == 2) { | |
// "releaseByArbitrator" | |
verifySpenderPKH = buyerPKH; | |
verifyOraclePKH = arbitratorPKH; | |
require(spenderSig == spenderSig); | |
require(spenderPK == spenderPK); | |
require(oracleSig == oracleSig); | |
require(oraclePK == oraclePK); | |
require(actionByte == actionByte); | |
require(escrowKey == escrowKey); | |
} else if (actionByte == 3) { | |
// "returnByBuyer" | |
verifySpenderPKH = sellerPHK; | |
verifyOraclePKH = buyerPKH; | |
} else if (actionByte == 4) { | |
// "returnByArbitrator" | |
verifySpenderPKH = sellerPHK; | |
verifyOraclePKH = arbitratorPKH; | |
} else { | |
// Action byte is unknown; fail. | |
require(false); | |
} | |
require(hash160(oraclePK) == verifyOraclePKH); | |
require(hash160(spenderPK) == verifySpenderPKH); | |
// Construct message | |
bytes oracleMessage = escrowKey + bytes(actionByte); | |
// Verify oracle's signature | |
require(checkDataSig(oracleSig, oracleMessage, oraclePK)); | |
// Verify spender's tx signature | |
require(checkSig(spenderSig, spenderPK)); | |
} | |
} |
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