ryancdotorg/brainflayer

Health v2 · maintenance only

Flags: no_releases no_license

Adoption not part of the score

1010 stars · 487 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Brainflayer is a proof-of-concept command-line cracker for cryptocurrency brainwallets and other low-entropy key derivation schemes, using libsecp256k1 for fast public key generation. It checks candidate passphrases against bloom-filtered sets of target addresses for Bitcoin and Ethereum.

Use cases

• crack a bitcoin brainwallet passphrase
• test weak brainwallet keys for security research
• audit low entropy cryptocurrency key generation
• check if a passphrase maps to a known ethereum address
• demonstrate brainwallet insecurity in a talk or paper

When to choose

• you need fast, large-scale brainwallet passphrase testing against a precomputed bloom filter
• you are doing security research on low-entropy key derivation in Bitcoin or Ethereum
• you want a Unix-philosophy tool that fits into a passphrase-generation pipeline

When to avoid

• you need a maintained tool with support - the author explicitly no longer maintains it
• you want to crack strong, high-entropy private keys - this only works on weak brainwallet-style keys
• you need a supported Windows or GUI tool - it is a Linux-oriented C command-line program
• you are looking for a general-purpose password cracker like hashcat

Facets

cli-tool · maturity maintenance

cryptography security cli security blockchain cli cpp brainwallet bitcoin ethereum secp256k1 password-cracking security-research proof-of-concept cryptocurrency linux

Member repositories

For agents

markdown · JSON · MCP: product_card(name="ryancdotorg/brainflayer")