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hVM & hBK

Using the hBK Demo App

📜 TL;DR:

Key features include:
Developers can easily integrate Bitcoin data into dApps without external services, simplifying Bitcoin-aware application development.

🌐 Overview

This demo app provides a user-friendly interface for querying Bitcoin information.
By abstracting the complexities of interacting with Bitcoin data, the app allows developers to seamlessly retrieve and use Bitcoin blockchain data in their dApps without needing external services.
This makes it an effective resource for experimenting with Bitcoin-aware applications and understanding hBK’s capabilities within the Hemi ecosystem.

🏁 Prerequisites

To follow along, you’ll need:

Nothing!

1. Get Address Balance

Retrieves the current balance (in satoshis) of a specified Bitcoin address.

// Sample output
514853116

Verifying our Output

2. Get Latest Block Header

Returns the latest Bitcoin block header containing metadata like hash, height, and timestamp.

// Sample output
{
  "height": 3520643,
  "blockHash": "0x00000000002be0cd198317218f374a484bd0b3c5fe4eaf098bb5dfc97d0fb8a7",
  "version": 536870912,
  "previousBlockHash": "0x00000000000000019bebcf5e1d1dc6baf664c5859f82add17f5543b3018c82de",
  "merkleRoot": "0xcc50e3a3ca39e37a7ccd5867a7f2a82192c98861f28a50d94f558305672d65de",
  "timestamp": 1733342457,
  "bits": 486604799,
  "nonce": 1100503385
}

Verifying our Output

3. Get Block Header by Height

Fetches the block header for a specific block height.

// Sample output
{
  "height": 1321358,
  "blockHash": "0x000000000000023bf34cd847acfcd73ad3b010f9a9434069e9bc5941cf61a1bf",
  "version": 536870912,
  "previousBlockHash": "0x00000000000002d213e95ae971060d49f93d51c3ce0ac84c452f76a45c962036",
  "merkleRoot": "0xd0f34249cd9b3929b56a418ab6fe965e685f1765f2dcd605ed08a1382199e506",
  "timestamp": 1527980035,
  "bits": 436539705,
  "nonce": 3252632758
}

Verifying our Output

4. Get Transaction Details

Fetches the details of a Bitcoin transaction using its transaction ID, including all of its inputs and outputs.

// Sample output

{
  "containingBlockHash": "0x00000000280425e8f1f2170230b3946bf4bf058d5ef9677a3f361d2fbead994f",
  "transactionVersion": "2",
  "size": "116",
  "vSize": "116",
  "lockTime": "0",
  "inputs": [
    {
      "inValue": "4834",
      "inputTxId": "0xe7b262c5ead12343f1c5734b65848fbe19362907fafcd9d07c999c9aa2ec79f0",
      "sourceIndex": "11689",
      "scriptSig": "0x",
      "sequence": "2",
      "fullScriptSigLength": "0",
      "containsFullScriptSig": false
    }
  ],
  "outputs": [],
  "totalInputs": "1",
  "totalOutputs": "0",
  "containsAllInputs": true,
  "containsAllOutputs": true
}

Verifying our Output

5. Get Transaction Confirmations

Retrieves the number of confirmations for a specific transaction based on its transaction ID.

// Sample output
653358

Verifying our Output

6. List Address UTXOs

Returns the UTXOs (Unspent Transaction Outputs) of a Bitcoin address, with pagination support.

// Sample output
[
  {
    "txId": "0xbd7b64df58115ca4e9c273b0bae477de3607154412a517dc31fdf5cd9f46e048",
    "index": "0",
    "value": "197506250"
  },
  {
    "txId": "0x452142a3dc4c9231ef8fd26674fa31ad55dfac5e880183d4b9d7452dd84e8b4f",
    "index": "0",
    "value": "199244750"
  },
  ...
]

Verifying our Output