Created
July 27, 2023 11:38
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| import org.ergoplatform.compiler.ErgoScalaCompiler._ | |
| import org.ergoplatform.playgroundenv.utils.ErgoScriptCompiler | |
| import org.ergoplatform.playground._ | |
| val blockchainSim = newBlockChainSimulationScenario("FundLock Scenario") | |
| val nanoergsInErg = 1000000000L | |
| val alice = blockchainSim.newParty("Alice") | |
| val aliceFunds = 200*nanoergsInErg | |
| val bob = blockchainSim.newParty("Bob") | |
| val depositAmount = 100*nanoergsInErg | |
| alice.generateUnspentBoxes(toSpend = aliceFunds) | |
| alice.printUnspentAssets() | |
| bob.printUnspentAssets() | |
| println("---------------------") | |
| /////////////////////////////////////////// | |
| // FundLock Contract // | |
| /////////////////////////////////////////// | |
| // The fund lock contract allows Bob to withdraw the funds after a certain deadline. | |
| // Before the deadline, the funds are locked and cannot be accessed by anyone. | |
| val fundLockScript = s""" HEIGHT > deadline && bobPK """.stripMargin | |
| val unlockTime = blockchainSim.getHeight + 500 | |
| val fundLockContract = ErgoScriptCompiler.compile(Map("deadline" -> unlockTime, | |
| "bobPK" -> bob.wallet.getAddress.pubKey), | |
| fundLockScript) | |
| val fundLockBox = Box(value = depositAmount, script = fundLockContract) | |
| val fundLockTransaction = Transaction( | |
| inputs = alice.selectUnspentBoxes(toSpend = aliceFunds), | |
| outputs = List(fundLockBox), | |
| fee = MinTxFee, | |
| sendChangeTo = alice.wallet.getAddress | |
| ) | |
| println(fundLockTransaction) | |
| println("---------------------") | |
| val fundLockTransactionSigned = alice.wallet.sign(fundLockTransaction) | |
| blockchainSim.send(fundLockTransactionSigned) | |
| alice.printUnspentAssets() | |
| println("---------------------") | |
| println("===== Bob withdraws the funds after deadline =====") | |
| blockchainSim.setHeight(unlockTime + 1) | |
| val bobWithdrawBox = Box(value = depositAmount - MinTxFee, | |
| script = contract(bob.wallet.getAddress.pubKey)) | |
| val bobWithdrawTransaction = Transaction( | |
| inputs = List(fundLockTransactionSigned.outputs(0)), | |
| outputs = List(bobWithdrawBox), | |
| fee = MinTxFee, | |
| sendChangeTo = bob.wallet.getAddress | |
| ) | |
| val bobWithdrawTransactionSigned = bob.wallet.sign(bobWithdrawTransaction) | |
| blockchainSim.send(bobWithdrawTransactionSigned) | |
| alice.printUnspentAssets() | |
| bob.printUnspentAssets() | |
| println("---------------------") |
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