HLTC on Stellar

htlc.ts

      const HtlcSequenceNumber = Ratchet1SequenceNumber.plus(3)

      const htlcAmount = 50
      const aliceOldBalance = 250
      const bobOldBalance = 750

      const HtlcTime = moment().unix()

      const HtlcTimeout = HtlcTime + TIMEOUT_CLAIM

      const challenge =
        '7196633b1ce5bf5fa369169ea81fc03a8238b38a888ef226a1e1bb42ab186bcb'

      const HtlcCancelTransaction = new TransactionBuilder(
        new Account(RatchetAccountId, HtlcSequenceNumber.plus(1).toString()),
        { timebounds: { minTime: HtlcTimeout } }
      )
        .addOperation(
          Operation.payment({
            destination: Bob.accountId(),
            amount: (bobOldBalance + htlcAmount).toString(),
            asset: Asset.native(),
          })
        )
        .addOperation(
          Operation.payment({
            destination: Alice.accountId(),
            amount: (aliceOldBalance - htlcAmount).toString(),
            asset: Asset.native(),
          })
        )
        .build()

      const HtlcFulfillTransaction = new TransactionBuilder(
        new Account(RatchetAccountId, HtlcSequenceNumber.plus(1).toString())
      )
        .addOperation(
          Operation.setOptions({
            signer: {
              sha256Hash: challenge,
              weight: 2,
            },
          })
        )
        .addOperation(
          Operation.payment({
            destination: Alice.accountId(),
            amount: aliceOldBalance.toString(),
            asset: Asset.native(),
          })
        )
        .addOperation(
          Operation.payment({
            destination: Bob.accountId(),
            amount: bobOldBalance.toString(),
            asset: Asset.native(),
          })
        )
        .addOperation(
          Operation.setOptions({
            signer: {
              sha256Hash: challenge,
              weight: 0,
            },
          })
        )
        .addOperation(
          Operation.setOptions({
            signer: {
              preAuthTx: HtlcCancelTransaction.hash(),
              weight: 0,
            },
          })
        )
        .build()

      const HtlcTransaction = new TransactionBuilder(
        new Account(RatchetAccountId, HtlcSequenceNumber.toString())
      )
        .addOperation(
          Operation.setOptions({
            signer: {
              preAuthTx: HtlcCancelTransaction.hash(),
              weight: 2,
            },
          })
        )
        .addOperation(
          Operation.setOptions({
            signer: {
              preAuthTx: HtlcFulfillTransaction.hash(),
              weight: 2,
            },
          })
        )