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ABIP32 compatible library for the Nano currency written in TypeScript with transpiled JavaScript committed to git. Based on the implementation bysuperdarkbit which is based on thisBIP32-ED25519 spec.

This library attempts to conform the theBIP32Interface defined by thebitcoinjs bip32 library.

The following are intentional deviations or incompatabilities:

• BIP32Interface.toWIF is not supported because Nano does not use WIF for private keys
• xprv's are 109 bytes instead of the standard 78 bytes in order to include the full 512 bit private key that is needed for BIP32-ED25519
• xpub's are 77 bytes instead of the standard 78 bytes because byte 45 is no longer needed to indicate whether the public key is compressed. ED25519 public keys are always compressed.
• BIP32-ED25519 requires a master secret such that it's SHA512 hash has the third highest bit of the first 32 bytes unset. In order to be compatible with all existing seeds, a conforming master secret is discovered by iterating over 32 bit integersi starting from 0 untilSHA512(i, seed) meets the requirements.

• Update tests
• Change bip32 public/private version number

TypeScript

import*asbip32from'bip32-nano';import{BIP32Interface}from'bip32-nano';letnode:BIP32Interface=bip32.fromBase58('xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi');letchild:BIP32Interface=node.derivePath('m/0/0');// ...

NodeJS

letbip32=require('bip32-nano')letnode=bip32.fromBase58('xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi')letchild=node.derivePath('m/0/0')// ...