blockchainbitcoinbitcoin-testnetblockcypher

Does bitcoin-js have a method to check unspent transaction status?


How does BlockCypher explorer get data about spent or unspent transaction status?

enter image description here

Does bitcoin-js library have some methods for it?


Solution

  • I'm not sure about bitcoin-js lib, but Blockcypher has API method:

    const fetch = require('cross-fetch')
    
    const getAddress = async address => {
      const url = `https://api.blockcypher.com/v1/btc/test3/addrs/${address}`
      const res = await fetch(url)
    
      return await res.json()
    }
    
    getAddress('mitTmNgXyoEANondxZns8dS6GcXTzVhJW6')
      .then(({txrefs}) => txrefs.filter(tx => tx.spent === false))
      .then(data => console.log(data))
    

    and you'll get sth like this

    [ { tx_hash: 'bdbd9253b052cb17afdf42c006c69f6d9f7513d2176db1c088fdbd2381edf2de',
        block_height: 1519165,
        tx_input_n: -1,
        tx_output_n: 1,
        value: 15800000,
        ref_balance: 32343852,
        spent: false, // @docs tx status
        confirmations: 60,
        confirmed: '2019-05-31T20:43:22Z',
        double_spend: false },
      { tx_hash: '4014e09c48ec4de6c4f1e82b38107f4ca77037e96e4989abe5ba5cf459d57700',
        block_height: 1519149,
        tx_input_n: -1,
        tx_output_n: 1,
        value: 10000,
        ref_balance: 17044852,
        spent: false, // @docs tx status
        confirmations: 76,
        confirmed: '2019-05-31T18:43:02Z',
        double_spend: false } ]