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Some use cases of sCrypt
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| 1 - P2PKH | |
| Pay-to-PubKey-Hash (P2PKH) contract is used to send bitcoins to a bitcoin address. | |
| `class P2PKH extends SmartContract { | |
| @prop() | |
| readonly address: Addr | |
| constructor(address: Addr) { | |
| super(address) | |
| this.address = address | |
| } | |
| @method() | |
| public unlock(sig: Sig, pubkey: PubKey) { | |
| assert( | |
| pubKey2Addr(pubkey) == this.address, | |
| "pub key does not correspond to address" | |
| ) | |
| assert(this.checkSig(sig, pubkey), "signature check failed") | |
| } | |
| } | |
| ` | |
| 2 - Stateful Contracts | |
| UTXO blockchains are stateless by default, sCrypt makes it possible to write stateful contracys on bitcoin (bsv) | |
| `export class Counter extends SmartContract { | |
| // stateful | |
| @prop(true) | |
| count: bigint | |
| constructor(count: bigint) { | |
| super(...arguments) | |
| this.count = count | |
| } | |
| @method() | |
| public incrementOnChain() { | |
| this.increment() | |
| // make sure balance in the contract does not change | |
| const amount: bigint = this.ctx.utxo.value | |
| // outputs containing the latest state and an optional change output | |
| const outputs: ByteString = this.buildStateOutput(amount) + this.buildChangeOutput() | |
| // verify unlocking tx has the same outputs | |
| assert(this.ctx.hashOutputs == hash256(outputs), 'hashOutputs mismatch') | |
| } | |
| @method() | |
| increment(): void { | |
| this.count++ | |
| } | |
| }` | |
| 3 - ScriptContext | |
| A public @method can get additional information beside its function parameters by accessing `this.ctx` in public methods. | |
| ` const amount: bigint = this.ctx.utxo.value | |
| // outputs containing the latest state and an optional change output | |
| const outputs: ByteString = this.buildStateOutput(amount) + this.buildChangeOutput() | |
| // verify unlocking tx has the same outputs | |
| assert(this.ctx.hashOutputs == hash256(outputs), 'hashOutputs mismatch') | |
| ` | |
| 4 - NFT (Ordinals) | |
| By using sCrypt-ord (Ordinal SDK) you can simply inscribe and transfer ordinals NFTs. | |
| `import { method, prop, assert, ByteString, sha256, Sha256 } from "scrypt-ts"; | |
| import { OrdinalNFT } from "scrypt-ord"; | |
| export class HashLockNFT extends OrdinalNFT { | |
| @prop() | |
| hash: Sha256; | |
| constructor(hash: Sha256) { | |
| super(); | |
| // Important: Call `init` after the `super()` statement. | |
| this.init(...arguments); | |
| this.hash = hash; | |
| } | |
| @method() | |
| public unlock(message: ByteString) { | |
| assert(this.hash === sha256(message), "hashes are not equal"); | |
| } | |
| }` | |
| 5 - Fungile Tokens (BSV20) | |
| The sCrypt-ord (SDK) also support protocol for creating fungible tokens (V1 and V2) on the Bitcoin SV blockchain. | |
| ` | |
| class HashLockFTV2 extends BSV20V2 { | |
| @prop() | |
| hash: Sha256 | |
| constructor(id: ByteString, sym: ByteString, max: bigint, dec: bigint, hash: Sha256) { | |
| super(id, sym, max, dec) | |
| this.init(...arguments) | |
| this.hash = hash | |
| } | |
| @method() | |
| public unlock(message: ByteString) { | |
| assert(this.hash == sha256(message), 'hashes are not equal') | |
| } | |
| } | |
| ` |
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