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I'm building an js related application that only stores my user's bitcoin private keys, but not the public key or bitcoin address to save space.

Is there a javascript library that can output the bitcoin address by only providing the bitcoin private key as an input?

  • You’re using javascript, but are concerned about storing tens of bytes? – Anonymous Feb 8 at 21:23
  • I need it to be as compact as possible due to storage constraint. If i can derive the bitcoin address from the private key, great. I'm using very low bandwidth communications, every byte saved is time saved. – Patoshi パトシ Feb 8 at 21:48
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    be careful sending private keys over the air. – JBaczuk Feb 8 at 21:53
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Try bitcoinjs-lib

The following will generate a P2SH(P2WPKH) address

const bitcoin = require('bitcoinjs-lib')

let ecpair = bitcoin.ECPair.fromWIF('L34XqVbrw1VSHsiavdpm4QGTRrFyH7RKAp7SFYf36gYcyLX2ieWi')
let address = bitcoin.payments.p2sh({redeem: bitcoin.payments.p2wpkh({ pubkey: ecpair.publicKey })}).address

> '3F1JMjuxgNFuK4kBxv4JXMEdQ2yvjuz939'

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