NULS JS

Block model

Block data can be obtained from the NULS node as base64 encoded bytes. We could then read this data and build our own block instance from it.

To make it easy, NULS JS provides an special class that can be used to parse a serialized block and return a block instance. Here is an example of how to do this:

Parse from bytes

import { Block } from 'nuls-js';

const blockBytes: Buffer = Buffer.from('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', 'base64');
const block: Block = Block.fromBytes(blockBytes);
...

Serialize to bytes

...
const blockBytes: Buffer = block.toBytes();
console.log(blockBytes.toString('base64'));
// AQAwFOnsZgEA/////wACFwUBAcwF/3oBFSS7Fl6ApWAIlmAgdHYoOMk6AAAAAACMCgEAAAAXBQEBylR/9QDCZ0wxtYW5PVlDE4lKjcuAwRgAAAAAAIwKAQAAAAA=
...

Cast to object

...
console.log(block.toObject());

{
  "hash": "0020f2ffb161b6a62d9fc4b3010d1376a7b454c4f193dacfb543c10c2c0b33f144d6",
  "preHash": "002095b722f9b5b201243dca31a7942e50442e8f1a0cc565e5c6cb4bc19d2c4f28f3",
  "merkleHash": "0020b7a4714847133c32ffb15e38e90cad00e6b29710f71f90136ed950b89a196860",
  "time": 1541572980000,
  "height": 67235,
  "txCount": 1,
  "consensusMemberCount": 13,
  "currentVersion": 2,
  "delay": 10000,
  "mainVersion": 2,
  "packingIndexOfRound": 3,
  "percent": 90,
  "roundIndex": 805435,
  "roundStartTime": 1541572950000,
  "stateRoot": "39799d05356c3942f34d1678c4bc0e04a201426cddde349d0419cb7343b92e20",
  "extend": "3b4a0c000d00f077e8ec6601030002000000020000005a00102700002039799d05356c3942f34d1678c4bc0e04a201426cddde349d0419cb7343b92e20",
  "signature": "2103a6cdfa9e0fd595027ed7637eaaae2b2e1659e827a0d2170cd365a0bbd844178500473045022100b3bc6fbc15e78e90e6caf1ed01143688d2aaece810f5d9b3391a3c84903bccfd022063f64dbbb59d53b2ae36ba7277080e2bee090e2695d0568450766c4baeaaedcb",
  "transactions": [
    {
      "hash": "0020b7a4714847133c32ffb15e38e90cad00e6b29710f71f90136ed950b89a196860",
      "type": 1,
      "blockHeight": 67235,
      "time": 1541572980000,
      "remark": "",
      "txData": null,
      "inputs": [],
      "outputs": [
        {
          "address": "TTas8d9BabAZmL4bNqZn3Ns9piBGgkFp",
          "na": 88089791,
          "lockTime": 68235
        },
        {
          "address": "TTayL21tpZt5GwtWamsyUN2hP8kwjAEp",
          "na": 99456216,
          "lockTime": 68235
        },
        {
          "address": "TTaybEoKxrV1SWEwKYDwTENHNH4qTest",
          "na": 79564972,
          "lockTime": 68235
        }
      ],
      "signature": ""
    }
  ]
}

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