Example: How to create a txHex with DashTx + DashKeys

[coolaj86]

DashSight is exclusively focused on interacting with an indexing and broadcasting web service.

In order to create the txHex you need to send via instantSend(txHex), you'll need to construct a transaction, sign it, and probably private key encoding/decoding along the way.

See the DashTx for Examples

Here's an example of that using Secp256k1 and DashTx:
(and you can use DashKeys for WIFs and such)

"use strict";

let DashTx = require("dashtx");

let dashTx = DashTx.create({
  version: 3,
  sign: signTx,
  toPublicKey: toPublicKey,
  addrToPubKeyHash: addrToPubKeyHash,
});

async function signTx({ privateKey, hash }) {
  let sigOpts = { canonical: true };
  let sigBuf = await Secp256k1.sign(hash, privateKey, sigOpts);
  return sigBuf;
}

async function toPublicKey(privKeyBuf) {
  let Secp256k1 = require("@dashincubator/secp256k1");
  let isCompressed = true;
  let pubBuf = Secp256k1.getPublicKey(privKeyBuf, isCompressed);
  return pubBuf;
}

async function addrToPubKeyHash(addr) {
  let Base58Check = require("@dashincubator/base58check").Base58Check;
  let b58c = Base58Check.create({
    pubKeyHashVersion: "4c",
    privateKeyVersion: "cc",
  });
  let parts = await b58c.verify(addr);
  return parts.pubKeyHash;
}

// keys that correspond to the available utxos
let privateKeys = {
  XmCyQ6qARLWXap74QubFMunngoiiA1QgCL: "YOUR_PRIVATE_KEY_HERE",
};

let coreUtxos = [
  {
    address: "XmCyQ6qARLWXap74QubFMunngoiiA1QgCL",
    outputIndex: 0,
    satoshis: 99809,
    script: "76a91473640d816ff4161d8c881da78983903bf9eba2d988ac",
    txId: "f92e66edc9c8da41de71073ef08d62c56f8752a3f4e29ced6c515e0b1c074a38",
  },
];

let payments = [
  { address: `Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx`, satoshis: 10000000 },
];

let txInfo = {
  inputs: coreUtxos,
  outputs: payments,
};

let keys = coreUtxos.map(function (utxo) {
  let privHex = privateKeys[utxo.address];
  let privBuf = Tx.utils.hexToU8(privHex);
  return privBuf;
});
let tx = dashTx.hashAndSignAll(txInfo, keys);

let txHex = tx.transaction;

let result = await dashsight.instantSend(txHex);

console.log(result);

Example transaction hex:

(inspect at https://live.blockcypher.com/dash/decodetx/)

030000000187ab81e88e2c19ca354f33f14d5b43b60d171ac851eb97dddd271b510cadbdb0000000
006b483045022100ec38c77b9f285d4c9aeeba36c1fac51bb88f7443185caf7eec21b170cc5d4062
0220098dcb5d90cb5f4ddc75ef54e2b2d1dbf220eb6fc28eed61c43192c0a420802c012103a6da86
f51829979a3c9f05251d9400d153111655526c6c25f8f82aba38b8a745ffffffff01188501000000
00001976a9149a00c2072c0209688cc6de5cc557af03e4f41b6388ac00000000

Example output:

{ "txid": "0f90cf5e03e8b8f8c4468f60fc8328cfcd5617fc2163f485fabfd227c692bf93" }