BNS V2 SDK

The official BNS V2 SDK for interacting with the Stacks Blockchain. This SDK provides a comprehensive set of tools for managing Bitcoin Name System (BNS) operations.

Table of Contents

1. Installation
2. Important Note About Transactions
3. Features
4. Read-Only Functions
5. Contract Calls
6. Subdomain Management
7. Network Configuration
8. Error Handling
9. Support
10. License

Installation

npm install bns-v2-sdk

Important Note About Transactions

This SDK only builds transaction payloads.

It does not:

• Sign transactions
• Broadcast transactions to the network
• Handle transaction lifecycle
• Manage wallet connections

To complete transactions, you'll need to:

1. Build the payload using this SDK
2. Sign the transaction using a wallet or the Stacks.js library
3. Broadcast the transaction to the network
4. Monitor the transaction status

Features

• Complete TypeScript support
• Comprehensive API for BNS operations
• Supports both mainnet and testnet
• Built-in error handling and validation
• Automatic fallback mechanisms
• Extensive read-only functions

Read-Only Functions

Name Operations

import {
  canRegisterName,
  getNameInfo,
  getOwner,
  getOwnerById,
  getRenewalHeight,
  canResolveName,
  getNamePrice,
  getLastTokenId,
  getBnsFromId,
  getIdFromBns,
  getPrimaryName,
  fetchUserOwnedNames,
  resolveNameZonefile,
} from "bns-v2-sdk";

// Check name availability
const available = await canRegisterName({
  fullyQualifiedName: "example.btc",
  network: "mainnet",
});

// Get full name information
const nameInfo = await getNameInfo({
  fullyQualifiedName: "example.btc",
  network: "mainnet",
});

// Get name owner
const owner = await getOwner({
  fullyQualifiedName: "example.btc",
  network: "mainnet",
});

// Get owner by NFT ID
const ownerById = await getOwnerById({
  id: 123,
  network: "mainnet",
});

// Get name renewal height
const renewalHeight = await getRenewalHeight({
  fullyQualifiedName: "example.btc",
  network: "mainnet",
});

// Check if name can resolve
const resolvable = await canResolveName({
  fullyQualifiedName: "example.btc",
  network: "mainnet",
});

// Get name price
const price = await getNamePrice({
  fullyQualifiedName: "example.btc",
  network: "mainnet",
});

// Get last token ID
const lastId = await getLastTokenId({
  network: "mainnet",
});

// Get BNS information from token ID
const nameInfo = await getBnsFromId({
  id: 123n,
  network: "mainnet",
});

// Get token ID from BNS name
const id = await getIdFromBns({
  fullyQualifiedName: "example.btc",
  network: "mainnet",
});

// Get primary name for address
const primaryName = await getPrimaryName({
  address: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

// Get all names owned by address
const ownedNames = await fetchUserOwnedNames({
  senderAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

// Get zonefile data (only for mainnet unless you have your own testnet node)
const zonefile = await resolveNameZonefile({
  fullyQualifiedName: "example.btc",
  network: "mainnet",
});

Namespace Operations

import {
  canNamespaceBeRegistered,
  getNamespaceProperties,
  getNamespacePrice,
} from "bns-v2-sdk";

// Check namespace availability
const available = await canNamespaceBeRegistered({
  namespace: "example",
  network: "mainnet",
});

// Get namespace properties
const properties = await getNamespaceProperties({
  namespace: "btc",
  network: "mainnet",
});

// Get namespace price
const price = await getNamespacePrice({
  namespace: "example",
  network: "mainnet",
});

Contract Calls

Name Registration and Management

import {
  buildNameClaimFastTx,
  buildPreorderNameTx,
  buildRegisterNameTx,
  buildRenewNameTx,
  buildTransferNameTx,
  buildSetPrimaryNameTx,
  buildUpdateZonefileTx,
} from "bns-v2-sdk";

// Fast claim a name (warning: snipeable)
const fastClaimPayload = await buildNameClaimFastTx({
  fullyQualifiedName: "myname.btc",
  stxToBurn: 1000000n,
  sendTo: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  senderAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

// Safe two-step registration
const preorderPayload = await buildPreorderNameTx({
  fullyQualifiedName: "myname.btc",
  salt: "random-salt-string",
  stxToBurn: 1000000n,
  senderAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

const registerPayload = await buildRegisterNameTx({
  fullyQualifiedName: "myname.btc",
  salt: "random-salt-string",
  stxToBurn: 1000000n,
  senderAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

// Renew name
const renewPayload = await buildRenewNameTx({
  fullyQualifiedName: "myname.btc",
  stxToBurn: 1000000n,
  senderAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

// Transfer name
const transferPayload = await buildTransferNameTx({
  fullyQualifiedName: "myname.btc",
  newOwnerAddress: "SP1HTBVD3JG9C05J7HBJTHGR0GGW7KXW28M5JS8QE",
  senderAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

// Set primary name
const setPrimaryPayload = await buildSetPrimaryNameTx({
  fullyQualifiedName: "myname.btc",
  senderAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

// Update zonefile
const updateZonefilePayload = await buildUpdateZonefileTx({
  fullyQualifiedName: "myname.btc",
  zonefileInputs: {
    owner: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
    general: "",
    twitter: "@example",
    url: "https://example.com",
    nostr: "",
    lightning: "",
    btc: "",
    subdomains: [],
  },
  senderAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

Marketplace Operations

import {
  buildListInUstxTx,
  buildUnlistInUstxTx,
  buildBuyInUstxTx,
} from "bns-v2-sdk";

// List name for sale
const listPayload = await buildListInUstxTx({
  id: 123n,
  price: 1000000n,
  commissionTraitAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  commissionTraitName: "commission-trait",
  senderAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

// Unlist name
const unlistPayload = await buildUnlistInUstxTx({
  id: 123n,
  senderAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

// Buy listed name
const buyPayload = await buildBuyInUstxTx({
  id: 123,
  expectedPrice: 1000000n,
  commissionTraitAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  commissionTraitName: "commission-trait",
  senderAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

Namespace Management

import {
  buildPreorderNamespaceTx,
  buildRevealNamespaceTx,
  buildLaunchNamespaceTx,
  buildNamespaceUpdatePriceTx,
  buildNamespaceFreezePriceTx,
  buildTurnOffManagerTransfersTx,
  buildFreezeManagerTx,
  buildImportNameTx,
} from "bns-v2-sdk";

// Preorder namespace
const preorderNamespacePayload = await buildPreorderNamespaceTx({
  namespace: "example",
  salt: "random-salt-string",
  stxToBurn: 1000000n,
  senderAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

// Reveal namespace
const revealNamespacePayload = await buildRevealNamespaceTx({
  namespace: "example",
  salt: "random-salt-string",
  priceFunction: {
    base: 1000n,
    coefficient: 100n,
    b1: 1n,
    b2: 1n,
    b3: 1n,
    b4: 1n,
    b5: 1n,
    b6: 1n,
    b7: 1n,
    b8: 1n,
    b9: 1n,
    b10: 1n,
    b11: 1n,
    b12: 1n,
    b13: 1n,
    b14: 1n,
    b15: 1n,
    b16: 1n,
    nonAlphaDiscount: 10n,
    noVowelDiscount: 10n,
  },
  lifetime: 52595n,
  namespaceImportAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  namespaceManagerAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  canUpdatePrice: true,
  managerTransfer: true,
  managerFrozen: false,
  senderAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

// Launch namespace
const launchNamespacePayload = await buildLaunchNamespaceTx({
  namespace: "example",
  senderAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

// Update namespace price function
const updatePricePayload = await buildNamespaceUpdatePriceTx({
  namespace: "example",
  priceFunction: {
    base: 1000n,
    coefficient: 100n,
    b1: 1n,
    b2: 1n,
    b3: 1n,
    b4: 1n,
    b5: 1n,
    b6: 1n,
    b7: 1n,
    b8: 1n,
    b9: 1n,
    b10: 1n,
    b11: 1n,
    b12: 1n,
    b13: 1n,
    b14: 1n,
    b15: 1n,
    b16: 1n,
    nonAlphaDiscount: 1n,
    noVowelDiscount: 1n,
  },
  senderAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

// Freeze namespace price function
const freezePricePayload = await buildNamespaceFreezePriceTx({
  namespace: "example",
  senderAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

// Turn off manager transfers
const turnOffManagerPayload = await buildTurnOffManagerTransfersTx({
  namespace: "example",
  senderAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

// Freeze manager
const freezeManagerPayload = await buildFreezeManagerTx({
  namespace: "example",
  senderAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

// Import name
const importNamePayload = await buildImportNameTx({
  namespace: "example",
  name: "myname",
  beneficiary: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  senderAddress: "SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9",
  network: "mainnet",
});

Subdomain Management

The BNS SDK provides functionality to manage subdomains through zonefile manipulation. Subdomains can be stored either directly in the parent domain's zonefile (on-chain) or in an external S3 bucket.

Zonefile Structure

interface ZonefileData {
  owner: string;            // Parent domain owner address
  general: string;          // General profile information
  twitter: string;          // Twitter handle
  url: string;             // Website URL
  nostr: string;           // Nostr public key
  lightning: string;        // Lightning address
  btc: string;             // Bitcoin address
  // Either subdomains OR externalSubdomainFile must be present
  subdomains?: SubdomainMap;
  externalSubdomainFile?: string;
}

interface SubdomainProperties {
  owner: string;
  general: string;
  twitter: string;
  url: string;
  nostr: string;
  lightning: string;
  btc: string;
}

Direct Zonefile Storage (On-chain)

import { buildUpdateZonefileTx } from '@stacks/bns';
import type { ZonefileData, SubdomainMap } from '@stacks/bns';

async function updateDirectSubdomains() {
  const subdomains: SubdomainMap = {
    "sub1": {
      owner: "SP2ZNGJ85ENDY6QRHQ5P2D4FXQJ6INMT00GBGJ2QX",
      general: "Profile information",
      twitter: "@example",
      url: "https://example.com",
      nostr: "npub1...",
      lightning: "lightning-address",
      btc: "bc1..."
    }
  };

  const zonefileData: ZonefileData = {
    owner: "SP3FGQ8Z7JY9BWYZ5WM53E0M9NK7WHJF0691NZ159",
    general: "Parent domain info",
    twitter: "@parent",
    url: "https://parent.com",
    nostr: "npub_parent",
    lightning: "parent-lightning",
    btc: "bc1_parent",
    subdomains: subdomains
  };

  const tx = await buildUpdateZonefileTx({
    fullyQualifiedName: "mydomain.btc",
    zonefileInputs: zonefileData,
    senderAddress: "SP3FGQ8Z7JY9BWYZ5WM53E0M9NK7WHJF0691NZ159",
    network: "mainnet"
  });
}

External Storage (S3 Bucket)

For managing large numbers of subdomains (>100), use external storage:

async function updateExternalSubdomains() {
  const zonefileData: ZonefileData = {
    owner: "SP3FGQ8Z7JY9BWYZ5WM53E0M9NK7WHJF0691NZ159",
    general: "Parent domain info",
    twitter: "@parent",
    url: "https://parent.com",
    nostr: "npub_parent",
    lightning: "parent-lightning",
    btc: "bc1_parent",
    externalSubdomainFile: "https://your-bucket.s3.amazonaws.com/subdomains.json"
  };

  const tx = await buildUpdateZonefileTx({
    fullyQualifiedName: "mydomain.btc",
    zonefileInputs: zonefileData,
    senderAddress: "SP3FGQ8Z7JY9BWYZ5WM53E0M9NK7WHJF0691NZ159",
    network: "mainnet"
  });
}

Requirements and Limitations

1. Only the parent domain owner can update the zonefile
2. The sender address must match the owner address
3. Choose either direct subdomains or external file storage
4. External S3 files must:
   • Use HTTPS protocol
   • End with .json extension
   • Be hosted on allowed S3 domains
   • Not contain query parameters or credentials
   • Contain valid JSON with a "subdomains" property
5. Size limits:
   • On-chain storage: Limited by BNS contract
   • External S3 file: Maximum 50MB
   • Recommended external storage for >100 subdomains

Network Configuration

import { configureNetwork } from "bns-v2-sdk";

configureNetwork({
  testnetFallbackUrl: "https://your-testnet-node.com",
});

Error Handling

try {
  const nameInfo = await getNameInfo({
    fullyQualifiedName: "example.btc",
    network: "mainnet",
  });
} catch (error) {
  if (error.message === "Name not found") {
    // Handle non-existent name
  } else {
    // Handle other errors
  }
}

Support

For issues and feature requests, please use the GitHub issues page.

License

MIT License