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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?
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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'
You’re using javascript, but are concerned about storing tens of bytes? – Anonymous – 2019-02-08T21:23:51.147
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 – 2019-02-08T21:48:07.070
2be careful sending private keys over the air. – JBaczuk – 2019-02-08T21:53:30.883