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Get UTXOs

The getUtxos method retrieves the Unspent Transaction Outputs (UTXOs) for one or more MNEE addresses. UTXOs represent the spendable MNEE tokens associated with an address and are essential for constructing new transactions.

Usage

Basic Usage

const address = '1G6CB3Ch4zFkPmuhZzEyChQmrQPfi86qk3';

// Returns up to 10 UTXOs by default
const utxos = await mnee.getUtxos(address);
console.log('UTXOs:', utxos);

For convenience, you can also call getEnoughUtxos() or getAllUtxos()

With Pagination

const address = '1G6CB3Ch4zFkPmuhZzEyChQmrQPfi86qk3';

// Get first page with 20 UTXOs
const page1 = await mnee.getUtxos(address, 0, 20);
console.log('First 20 UTXOs:', page1);

// Get second page
const page2 = await mnee.getUtxos(address, 1, 20);
console.log('Next 20 UTXOs:', page2);

// Get UTXOs in ascending order (oldest first)
const ascUtxos = await mnee.getUtxos(address, 0, 50, 'asc');
console.log('Oldest UTXOs first:', ascUtxos);

Multiple Addresses

const addresses = ['1G6CB3Ch4zFkPmuhZzEyChQmrQPfi86qk3', '1BFaJwJz5KPYGe28afDkGswbuKK6uK8hzQ'];

// Returns up to 10 UTXOs by default
const utxos = await mnee.getUtxos(addresses);
console.log('UTXOs from all addresses:', utxos);

// Get more UTXOs by specifying size
const moreUtxos = await mnee.getUtxos(addresses, 0, 100, 'desc');
console.log('First 100 UTXOs (newest first):', moreUtxos);

Parameters

  • address: Single Bitcoin address or array of addresses

  • page (optional): Page number starting from 0

  • size (optional): Number of UTXOs per page (default: 10)

  • order (optional): Sort order - 'asc' for oldest first, 'desc' for newest first (default: 'desc')

Response

The method returns a Promise that resolves to an array of MNEEUtxo objects. Each UTXO contains detailed information about the MNEE tokens, including BSV21 protocol data and cosigner information.

Sample Response

[
  {
    "data": {
      "bsv21": {
        "amt": 95799,
        "dec": 5,
        "icon": "1FGEBTUu7EqWWK5DKrG6pxjEGLahpATnA8",
        "id": "ae59f3b898ec61acbdb6cc7a245fabeded0c094bf046f35206a3aec60ef88127_0",
        "op": "transfer",
        "sym": "MNEE"
      },
      "cosign": {
        "address": "17cgGUmStWwcYgHg3kxmzXSp6JUbj8XA3u",
        "cosigner": "03d47c2e48c59b3f58b96c9e616d0a84c6e02725e47beefcb5b5a8fbe21a3c5e3a"
      }
    },
    "height": 857421,
    "idx": 0,
    "outpoint": "d7fe19af19332d8ab1d83ed82003ecc41c8c5def8e786b58e90512e82087302a:0",
    "owners": ["1G6CB3Ch4zFkPmuhZzEyChQmrQPfi86qk3"],
    "satoshis": 1000,
    "score": 85742100001
  },
  {
    "data": {
      "bsv21": {
        "amt": 50000,
        "dec": 5,
        "icon": "1FGEBTUu7EqWWK5DKrG6pxjEGLahpATnA8",
        "id": "ae59f3b898ec61acbdb6cc7a245fabeded0c094bf046f35206a3aec60ef88127_0",
        "op": "transfer",
        "sym": "MNEE"
      },
      "cosign": {
        "address": "1PqgNQwyPbc1Ue8QwEDFJUP2monKv9hSo4",
        "cosigner": "03d47c2e48c59b3f58b96c9e616d0a84c6e02725e47beefcb5b5a8fbe21a3c5e3a"
      }
    },
    "height": 857420,
    "idx": 1,
    "outpoint": "a9b2c3d4e5f678901234567890abcdef1234567890abcdef1234567890abcdef:1",
    "owners": ["1G6CB3Ch4zFkPmuhZzEyChQmrQPfi86qk3"],
    "satoshis": 1000,
    "score": 85742000002
  }
]

UTXO Properties

Main Properties

  • outpoint: The full UTXO identifier in format txid:vout

  • height: The block height when this UTXO was created

  • idx: The output index within the transaction

  • owners: Array of addresses that can spend this UTXO

  • satoshis: The BSV satoshis in this output (not MNEE amount)

  • score: A sortable score based on height and index

BSV21 Data (data.bsv21)

  • amt: The amount of MNEE tokens in atomic units (100,000 = 1 MNEE)

  • dec: Number of decimal places (5 for MNEE)

  • icon: The icon address for the token

  • id: The token ID

  • op: The operation type (typically "transfer")

  • sym: The token symbol ("MNEE")

Cosigner Data (data.cosign)

  • address: The cosigner address for this UTXO

  • cosigner: The cosigner public key

Common Use Cases

Calculate Total Spendable Balance

// WARNING: Default only returns 10 UTXOs - may not be complete balance!
// Specify a larger size or use pagination for accurate balance
const utxos = await mnee.getUtxos(address, 0, 1000); // Get up to 1000 UTXOs
const totalAtomicUnits = utxos.reduce((sum, utxo) => sum + utxo.data.bsv21.amt, 0);
const totalMNEE = mnee.fromAtomicAmount(totalAtomicUnits);
console.log(`Total spendable: ${totalMNEE} MNEE`);

// For accurate balance, consider using the balance() method instead:
const balance = await mnee.balance(address);
console.log(`Total balance: ${balance.decimalAmount} MNEE`);

Get All UTXOs with Pagination

async function getAllUtxosWithPagination(address) {
  const allUtxos = [];
  const pageSize = 100;
  let page = 0;
  
  while (true) {
    const utxos = await mnee.getUtxos(address, page, pageSize);
    allUtxos.push(...utxos);
    
    console.log(`Retrieved page ${page + 1}: ${utxos.length} UTXOs`);
    
    // If we got less than pageSize, we've reached the end
    if (utxos.length < pageSize) break;
    
    page++;
  }
  
  console.log(`Total UTXOs retrieved: ${allUtxos.length}`);
  return allUtxos;
}

Find UTXOs Above a Certain Amount

const utxos = await mnee.getUtxos(address);
const largeUtxos = utxos.filter(utxo => utxo.data.bsv21.amt >= 10000); // 0.1 MNEE or more
console.log(`Found ${largeUtxos.length} UTXOs with 0.1 MNEE or more`);

Prepare UTXOs for Multi-Source Transfer

const addresses = ['address1', 'address2', 'address3'];
const allUtxos = await mnee.getUtxos(addresses);

// Group UTXOs by owner address for transferMulti
const utxosByAddress = allUtxos.reduce((acc, utxo) => {
  const owner = utxo.owners[0];
  if (!acc[owner]) acc[owner] = [];
  acc[owner].push(utxo);
  return acc;
}, {});

// Convert to transferMulti format
const inputs = allUtxos.map(utxo => ({
  txid: utxo.outpoint.split(':')[0],
  vout: parseInt(utxo.outpoint.split(':')[1]),
  wif: 'private-key-for-owner' // You need to provide the WIF for each UTXO owner
}));

Filter UTXOs by Operation Type

const utxos = await mnee.getUtxos(address);
const transferUtxos = utxos.filter(utxo => utxo.data.bsv21.op === 'transfer');
console.log(`Found ${transferUtxos.length} transfer UTXOs`);

Performance Considerations

  • The API returns only 10 UTXOs by default - specify a larger size parameter if you need more

  • For addresses with many UTXOs, use pagination to retrieve all of them:

// Get all UTXOs for an address
async function getAllUtxos(address) {
  const allUtxos = [];
  const pageSize = 100; // Balance between efficiency and memory
  let page = 0;
  let hasMore = true;
  
  while (hasMore) {
    const utxos = await mnee.getUtxos(address, page, pageSize);
    allUtxos.push(...utxos);
    hasMore = utxos.length === pageSize;
    page++;
  }
  
  return allUtxos;
}

Important Notes

  • Default limit is 10 UTXOs - Always specify the size parameter if you need more

  • If an address has more UTXOs than your page size, use pagination to retrieve all of them

  • For just checking balance, use the balance() method which is more efficient

  • UTXOs are sorted by score (based on height and index) in descending order by default

See Also

PreviousCheck BalanceNextTransfer

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