Scan a UTXO with P2S address

scan_p2s.ts

import {Constant} from "ergo-lib-wasm-browser"
import JSONBigInt from "json-bigint"

const JSONBI = JSONBigInt({useNativeBigInt: true})

type SigmaRust = typeof import("ergo-lib-wasm-browser")

class Module {
  _ergo?: SigmaRust

  async load(node: boolean = false): Promise<SigmaRust> {
    if (this._ergo === undefined) {
      this._ergo = await (node ? import("ergo-lib-wasm-nodejs") : import("ergo-lib-wasm-browser"))
    }
    return this._ergo!
  }

  // Need to expose through a getter to get Flow to detect the type correctly
  get SigmaRust(): SigmaRust {
    return this._ergo!
  }
}

// need this otherwise Wallet's flow type isn't properly exported
const RustModule: Module = new Module()

const walletAddresses = ["9g1N1xqhrNG1b2TkmFcQGTFZ47EquUYUZAiWWCBEbZaBcsMhXJU"]

const p2sBox = JSONBI.parse(`{
    "boxId": "3c6569cd9d79016699ddf8cae47623474fa557851abc6fbe8375b4005a440930",
    "transactionId": "7df66ea36e75fd4bedd00ebb58f0555e6d471613c5b9d68cac53df35412cfd02",
    "index": 0,
    "ergoTree": "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",
    "address": "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",
    "creationHeight": 506880,
    "value": "12550000",
    "assets": [
        {
            "tokenId": "ef802b475c06189fdbf844153cdc1d449a5ba87cce13d11bb47b5a539f27f12b",
            "index": 0,
            "amount": "200000000",
            "name": "WT_ERG",
            "decimals": 9,
            "type": "EIP-004"
        }
    ],
    "additionalRegisters": {},
    "spentTransactionId": null,
    "extension": {}
}`)

export function scanBox() {
  const walletPKs = walletAddresses.map((a) =>
    RustModule.SigmaRust.Address
      .from_base58(a)
      .to_ergo_tree()
      .to_base16_bytes()
      .replace(/^0008cd/, "")
  )
  const ergoTreeParsed = RustModule.SigmaRust.ErgoTree.from_base16_bytes(p2sBox.ergoTree)
  const constantsNum = ergoTreeParsed.constants_len()
  const constants: Constant[] = []
  for (let i = 0; i < constantsNum; i++) {
    constants.push(ergoTreeParsed.get_constant(i)!)
  }

  let matchedPk: string | undefined = undefined

  const SigmaPropConstPat = new RegExp(/^08cd([0-9a-fA-F]+)$/)

  for (const c of constants) {
    const hex = c.encode_to_base16()
    const matched = SigmaPropConstPat.exec(hex)
    if (matched && walletPKs.includes(matched[1]))
      matchedPk = matched[1]
  }

  const canBeSpentMaybe = !!matchedPk

  console.log("matchedPk ", matchedPk)
  console.log("canBeSpentMaybe ", canBeSpentMaybe)
}