@unspent/phi
Version:
a collection of anyone can spend contracts
36 lines • 4.25 kB
JavaScript
// Automatically Generated
export const artifact = {
"contractName": "Perpetuity",
"constructorInputs": [
{
"name": "period",
"type": "int"
},
{
"name": "recipientLockingBytecode",
"type": "bytes"
},
{
"name": "executorAllowance",
"type": "int"
},
{
"name": "decay",
"type": "int"
}
],
"abi": [
{
"name": "execute",
"inputs": []
}
],
"bytecode": "OP_TXVERSION OP_2 OP_GREATERTHANOREQUAL OP_VERIFY OP_CHECKSEQUENCEVERIFY OP_DROP OP_TXINPUTCOUNT OP_1 OP_NUMEQUALVERIFY OP_INPUTINDEX OP_UTXOVALUE OP_DUP OP_4 OP_ROLL OP_DIV OP_0 OP_OUTPUTBYTECODE OP_3 OP_ROLL OP_EQUALVERIFY OP_DUP e803 OP_GREATERTHAN OP_IF OP_0 OP_OUTPUTVALUE OP_OVER OP_GREATERTHANOREQUAL OP_VERIFY OP_2DUP OP_SUB OP_3 OP_PICK OP_SUB OP_1 OP_OUTPUTBYTECODE OP_INPUTINDEX OP_UTXOBYTECODE OP_EQUALVERIFY OP_1 OP_OUTPUTVALUE OP_OVER OP_GREATERTHANOREQUAL OP_VERIFY OP_DROP OP_ELSE OP_OVER OP_3 OP_PICK OP_SUB OP_0 OP_OUTPUTVALUE OP_OVER OP_GREATERTHANOREQUAL OP_VERIFY OP_DROP OP_ENDIF OP_2DROP OP_DROP OP_1",
"source": "pragma cashscript ^0.8.0;\n\n// Unspent Phi\n//\n// Perpetuity v2 \n//\n// Perpetuity: fractional payments at regular intervals using rolling timelocks.\n//\n// [ ] BIP-68 timelocks were introduced in version 2 transactions, enforce versions.\n// [ ] The input must have aged for a predefined number of blocks (the period)\n// [ ] All utxos must be processed atomically. One coin per tx, no merging.\n// Calculate the installment\n// [ ] Require the first output is to the receipt.\n// If installment is greater than 1000 sats\n// [ ] require the installment is paid,\n// calculate the remainder value\n// [ ] return the remainder,\n// [ ] to the contract\n// Otherwise, \n// calculate the balloon payment amount\n// [ ] require the receipt receive the balloon payment.\n//\n// \n// String & op_return serializations:\n//\n// P,2,<period>,<receiptLockingBytecode>,<decay>,<contractBytecode>\n// \n// 6a 047574786f\n// 01 50\n// 01 02\n// ...\n//\n\ncontract Perpetuity(\n\n // interval for payouts, in blocks\n int period,\n\n // lockingBytecode of the beneficiary, \n // the address receiving payments\n bytes recipientLockingBytecode,\n\n // extra allowance for administration of contract\n // fees are paid from executors' allowance. \n int executorAllowance,\n\n // divisor for the payout, \n // each payout must be greater than \n // the input amount\n // divided by this number\n int decay\n\n) {\n function execute() {\n\n // Force tx version greater than 2 to force BIP68 support\n require(tx.version >= 2);\n \n // Check that time has passed and that time locks are enabled\n require(tx.age >= period);\n\n // Limit to a single utxo input\n require(tx.inputs.length == 1);\n\n // Get the input value on the contract\n int currentValue = tx.inputs[this.activeInputIndex].value;\n\n // The payout is the current value divided by the decay\n int installment = currentValue/decay;\n \n // Check that the first output sends to the recipient\n require(tx.outputs[0].lockingBytecode == recipientLockingBytecode);\n\n // An installment below the dust threshold isn't spendable\n if(installment > 1000) {\n\n // Check that the output sends a normal installment\n require(tx.outputs[0].value >= installment);\n\n // Calculate value returned to the contract\n int returnedValue = currentValue - installment - executorAllowance;\n \n // require the second output match the active bytecode\n require(tx.outputs[1].lockingBytecode == tx.inputs[this.activeInputIndex].lockingBytecode);\n \n // balance was returned to the contract\n require(tx.outputs[1].value >= returnedValue);\n\n } else{\n\n // calculate the remainder of the contract\n int balloonPaymentValue = currentValue - executorAllowance;\n\n // Require the balance to be liquidated\n require(tx.outputs[0].value >= balloonPaymentValue);\n }\n }\n}",
"compiler": {
"name": "cashc",
"version": "0.8.2"
},
"updatedAt": "2025-02-12T18:47:33.493Z"
};
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