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  BIP: XXXX
  Layer: Applications
  Title: Multi-Application Hierarchy for Deterministic Entropy
  Author: Ethan Kosakovsky <ethankosakovsky@protonmail.com>
  Comments-Summary: No comments yet.
  Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-XXXX
  Status: Proposed
  Type: Standards Track
  Created: 2020-03-20
  License: BSD-2-Clause
           OPL

Table of Contents

Abstract

This BIP provides standardized path for different applications of BIP-entropy

Applications

Application number define how entropy will be used post processing. Some basic examples follow:

Derivation path uses the format m/83696968/' + /app_no' + /index' where app_no path for the application, and `index` in the index.

BIP39

Application number: 39'

Entropy is truncated to the number of bits required to map to the relevant word length 128 bits for 12 words, 256 bits for 24 words.

The derivation path format is: m/83696968'/39' + /language' + /words' + /index'

Example a BIP39 mnemonic with 12 English words (first index) would have the path m/83696968'/39'/0'/12'/0' the next key would be m/83696968'/39'/0'/12'/1' etc.

Language Table

Wordlist Code
English 0'
Japanese 1'
Korean 2'
Spanish 3'
Chinese (Simplified) 4'
Chinese (Traditional) 5'
French 6'
Italian 7'
Czech 8'

Words Table

Words Entropy Code
12 words 128 bits 12'
18 words 192 bits 18'
24 words 256 bits 24'

12 English words

BIP39 English 12 word mnemonic seed

128 bits of entropy as input to BIP39 to derive 12 word mnemonic

INPUT:

  • MASTER BIP32 ROOT KEY: xprv9s21ZrQH143K2LBWUUQRFXhucrQqBpKdRRxNVq2zBqsx8HVqFk2uYo8kmbaLLHRdqtQpUm98uKfu3vca1LqdGhUtyoFnCNkfmXRyPXLjbKb
  • PATH: m/83696968'/39'/0'/12'/0'
OUTPUT:
  • DERIVED ENTROPY=6250b68daf746d12a24d58b4787a714b
  • DERIVED BIP39 MNEMONIC=girl mad pet galaxy egg matter matrix prison refuse sense ordinary nose

18 English words

BIP39 English 18 word mnemonic seed

196 bits of entropy as input to BIP39 to derive 18 word mnemonic

INPUT:

  • MASTER BIP32 ROOT KEY: xprv9s21ZrQH143K2LBWUUQRFXhucrQqBpKdRRxNVq2zBqsx8HVqFk2uYo8kmbaLLHRdqtQpUm98uKfu3vca1LqdGhUtyoFnCNkfmXRyPXLjbKb
  • PATH: m/83696968'/39'/0'/18'/0'
OUTPUT:
  • DERIVED ENTROPY=938033ed8b12698449d4bbca3c853c66b293ea1b1ce9d9dc
  • DERIVED BIP39 MNEMONIC=near account window bike charge season chef number sketch tomorrow excuse sniff circle vital hockey outdoor supply token

24 English words

Derives 24 word BIP39 mnemonic seed

256 bits of entropy as input to BIP39 to derive 24 word mnemonic

INPUT:

  • MASTER BIP32 ROOT KEY: xprv9s21ZrQH143K2LBWUUQRFXhucrQqBpKdRRxNVq2zBqsx8HVqFk2uYo8kmbaLLHRdqtQpUm98uKfu3vca1LqdGhUtyoFnCNkfmXRyPXLjbKb
  • PATH: m/83696968'/39'/0'/24'/0'
OUTPUT:
  • DERIVED ENTROPY=ae131e2312cdc61331542efe0d1077bac5ea803adf24b313a4f0e48e9c51f37f
  • DERIVED BIP39 MNEMONIC=puppy ocean match cereal symbol another shed magic wrap hammer bulb intact gadget divorce twin tonight reason outdoor destroy simple truth cigar social volcano

Bitcoin Core HDSEED

Application number: 2'

Uses 256 bits of entropy as the secret exponent to derive a private key and encode as a compressed WIF which will be used as the hdseed for Bitcoin Core wallets.

Path format is m/83696968'/2'/ + /index'

INPUT:

  • MASTER BIP32 ROOT KEY: xprv9s21ZrQH143K2LBWUUQRFXhucrQqBpKdRRxNVq2zBqsx8HVqFk2uYo8kmbaLLHRdqtQpUm98uKfu3vca1LqdGhUtyoFnCNkfmXRyPXLjbKb
  • PATH: m/83696968'/2'/0'
OUTPUT
  • DERIVED ENTROPY=d248faa1bcf373e0aa5f919e4edae6c52ebca2338448b18b68c27064b135fe35
  • DERIVED WIF=L4GUerbexd7nccbJnYUU1JAQvDwQfFjbLzUr4vqSxEJZKAqpvTn4

Reference Implementation

Python implementation: python-bipentropy

Copyright

This BIP is dual-licensed under the Open Publication License and BSD 2-clause license.