@stacks/bns

A package for interacting with the BNS contract on the Stacks blockchain.

What is BNS?

The Blockchain Naming System (BNS) is a network system that binds Stacks usernames to off-chain state without relying on any central points of control.

Installation

npm install --save @stacks/bns
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Example Usages

Check availability

Check if name can be registered

import { canRegisterName } from '@stacks/bns';
import { StacksTestnet, StacksMainnet } from '@stacks/network';

// for mainnet, use `StacksMainnet()`
const network = new StacksTestnet();
const fullyQualifiedName = 'name.id';

const result = await canRegisterName({ fullyQualifiedName, network });
// true / false
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Get name price

Get price of name registration in microstacks

import { getNamePrice } from '@stacks/bns';
import { StacksTestnet, StacksMainnet } from '@stacks/network';

// for mainnet, use `StacksMainnet()`
const network = new StacksTestnet();
const fullyQualifiedName = 'name.id';

const price = await getNamePrice({ fullyQualifiedName, network });
// price of name registration in microstacks
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Steps to register name

Send two transaction to secure a name, preorder and then register.

1. Preorder: Generates a name preorder transaction. First step in registering a name. This transaction does not reveal the name that is about to be registered. And it sets the amount of STX to be burned for the registration.
2. Register: Generates a name transfer transaction. This changes the owner of the registered name.

Preorder

import { buildPreorderNameTx } from '@stacks/bns';
import { StacksTestnet, StacksMainnet } from '@stacks/network';
import {
  TxBroadcastResult,
  broadcastTransaction,
  publicKeyToString,
  TransactionSigner,
  createStacksPrivateKey,
  pubKeyfromPrivKey,
} from '@stacks/transactions';

// for mainnet, use `StacksMainnet()`
const network = new StacksTestnet();
const fullyQualifiedName = 'name.id';
const salt = 'salt';
const stxToBurn = 200n;
// warning: Do not expose your private key by hard coding in code. Use env variables to load private keys.
const privateKey = '<insert private key here>'; // process.env.privateKey
const publicKey = publicKeyToString(pubKeyfromPrivKey(privateKey));

// construct an unsigned bns priorder-name transaction
// note: builder functions build transactions with AnchorMode set to Any
const unsignedTX = await buildPreorderNameTx({
  fullyQualifiedName,
  salt,
  stxToBurn,
  publicKey,
  network,
});

// Sign the transaction with private key and broadcast to the network
const signer = new TransactionSigner(unsignedTX);
signer.signOrigin(createStacksPrivateKey(privateKey));

const reply: TxBroadcastResult = await broadcastTransaction(signer.transaction, network);
// reply.txid
// Wait for the transaction to be confirmed before sending register transaction
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Register

import { buildRegisterNameTx } from '@stacks/bns';
import { StacksTestnet, StacksMainnet } from '@stacks/network';
import {
  TxBroadcastResult,
  broadcastTransaction,
  publicKeyToString,
  TransactionSigner,
  createStacksPrivateKey,
  pubKeyfromPrivKey,
} from '@stacks/transactions';

// for mainnet, use `StacksMainnet()`
const network = new StacksTestnet();
const fullyQualifiedName = 'name.id';
// warning: Do not expose your private key by hard coding in code. Use env variables to load private keys.
const privateKey = '<insert private key here>'; // process.env.privateKey
const zonefile = 'zonefile';
const salt = 'salt';
const publicKey = publicKeyToString(pubKeyfromPrivKey(privateKey));

// construct an unsigned bns register-name transaction
// note: builder functions build transactions with AnchorMode set to Any
const unsignedTX = await buildRegisterNameTx({
  fullyQualifiedName,
  publicKey,
  salt,
  zonefile,
  network,
});
// Sign the transaction with private key and broadcast to the network
const signer = new TransactionSigner(unsignedTX);
signer.signOrigin(createStacksPrivateKey(privateKey));

const reply: TxBroadcastResult = await broadcastTransaction(
  signer.transaction,
  network,
  Buffer.from(zonefile)
);
// reply.txid
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Transfer name

Transfer the ownership to other address

import { buildTransferNameTx } from '@stacks/bns';
import { StacksTestnet, StacksMainnet } from '@stacks/network';
import {
  TxBroadcastResult,
  broadcastTransaction,
  publicKeyToString,
  TransactionSigner,
  createStacksPrivateKey,
  pubKeyfromPrivKey,
} from '@stacks/transactions';

// for mainnet, use `StacksMainnet()`
const network = new StacksTestnet();
const fullyQualifiedName = 'name.id';
const newOwnerAddress = 'ST1HB1T8WRNBYB0Y3T7WXZS38NKKPTBR3EG9EPJKR';
// warning: Do not expose your private key by hard coding in code. Use env variables to load private keys.
const privateKey = '<insert private key here>'; // process.env.privateKey
const zonefile = 'zonefile';
const publicKey = publicKeyToString(pubKeyfromPrivKey(privateKey));

// construct an unsigned bns transfer-name transaction
// note: builder functions build transactions with AnchorMode set to Any
const unsignedTX = await buildTransferNameTx({
  fullyQualifiedName,
  newOwnerAddress,
  publicKey,
  zonefile,
  network,
});

// Sign the transaction with private key and broadcast to the network
const signer = new TransactionSigner(unsignedTX);
signer.signOrigin(createStacksPrivateKey(privateKey));

const reply: TxBroadcastResult = await broadcastTransaction(
  signer.transaction,
  network,
  Buffer.from(zonefile)
);
// reply.txid
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Update name

Generates a name update transaction. This changes the zonefile for the registered name.

import { buildUpdateNameTx } from '@stacks/bns';
import { StacksTestnet, StacksMainnet } from '@stacks/network';
import {
  TxBroadcastResult,
  broadcastTransaction,
  publicKeyToString,
  TransactionSigner,
  createStacksPrivateKey,
  pubKeyfromPrivKey,
} from '@stacks/transactions';

// for mainnet, use `StacksMainnet()`
const network = new StacksTestnet();
const fullyQualifiedName = 'name.id';
// warning: Do not expose your private key by hard coding in code. Use env variables to load private keys.
const privateKey = '<insert private key here>'; // process.env.privateKey
const zonefile = 'zonefile';
const publicKey = publicKeyToString(pubKeyfromPrivKey(privateKey));

// construct an unsigned bns update-name transaction
// note: builder functions build transactions with AnchorMode set to Any
const unsignedTX = await buildUpdateNameTx({
  fullyQualifiedName,
  zonefile,
  publicKey,
  network,
});
// Sign the transaction with private key and broadcast to the network
const signer = new TransactionSigner(unsignedTX);
signer.signOrigin(createStacksPrivateKey(privateKey));

const reply: TxBroadcastResult = await broadcastTransaction(
  signer.transaction,
  network,
  Buffer.from(zonefile)
);
// reply.txid
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Renew name

Generates a name renew transaction. This renews a name registration.

import { buildRenewNameTx } from '@stacks/bns';
import { StacksTestnet, StacksMainnet } from '@stacks/network';
import {
  TxBroadcastResult,
  broadcastTransaction,
  publicKeyToString,
  TransactionSigner,
  createStacksPrivateKey,
  pubKeyfromPrivKey,
} from '@stacks/transactions';

// for mainnet, use `StacksMainnet()`
const network = new StacksTestnet();
const fullyQualifiedName = 'name.id';
const stxToBurn = 10n;
const newOwnerAddress = 'ST1HB1T8WRNBYB0Y3T7WXZS38NKKPTBR3EG9EPJKR';
// warning: Do not expose your private key by hard coding in code. Use env variables to load private keys.
const privateKey = '<insert private key here>'; // process.env.privateKey
const zonefile = 'zonefile';
const publicKey = publicKeyToString(pubKeyfromPrivKey(privateKey));

// construct an unsigned bns renew-name transaction
// note: builder functions build transactions with AnchorMode set to Any
const unsignedTX = await buildRenewNameTx({
  fullyQualifiedName,
  stxToBurn,
  newOwnerAddress,
  zonefile,
  publicKey,
  network,
});

// Sign the transaction with private key and broadcast to the network
const signer = new TransactionSigner(unsignedTX);
signer.signOrigin(createStacksPrivateKey(privateKey));

const reply: TxBroadcastResult = await broadcastTransaction(
  signer.transaction,
  network,
  Buffer.from(zonefile)
);
// reply.txid
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Revoke name

Generates a name revoke transaction. This revokes a name registration.

import { buildRevokeNameTx } from '@stacks/bns';
import { StacksTestnet, StacksMainnet } from '@stacks/network';
import {
  TxBroadcastResult,
  broadcastTransaction,
  publicKeyToString,
  TransactionSigner,
  createStacksPrivateKey,
  pubKeyfromPrivKey,
} from '@stacks/transactions';

// for mainnet, use `StacksMainnet()`
const network = new StacksTestnet();
const fullyQualifiedName = 'name.id';
// warning: Do not expose your private key by hard coding in code. Use env variables to load private keys.
const privateKey = '<insert private key here>'; // process.env.privateKey
const publicKey = publicKeyToString(pubKeyfromPrivKey(privateKey));

// construct an unsigned bns revoke-name transaction
// note: builder functions build transactions with AnchorMode set to Any
const unsignedTX = await buildRevokeNameTx({
  fullyQualifiedName,
  publicKey,
  network,
});
// Sign the transaction with private key and broadcast to the network
const signer = new TransactionSigner(unsignedTX);
signer.signOrigin(createStacksPrivateKey(privateKey));

const reply: TxBroadcastResult = await broadcastTransaction(signer.transaction, network);
// reply.txid
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