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Brave Wallet Seed Wiki
Brave Wallet is a native Brave Browser implementation of an Ethereum (or any EVM compatible chain) remote client. Please note this is different than the old Brave Ethereum wallet based on a fork of MetaMask (wiki can be found here). The native implementation requires less processes to run and may even be extended to support other protocols in the future (e.g. Doge, Solana, etc.).
This protocol adopts the BIP-32 (HD-Wallet) specification and maintains its own implementation of a Keyring Controller. HD-Wallet uses the bitcoin-core implementations of secp256k1, ripemd160, and base58. The remaining cryptographic wallet functionality is provided by BorringSSL which is used in Chromium in place of OpenSSL (BorringSSL is maintained by Google).
As in the old MetaMask extension, we adopt BIP-39 mnemonic keywords based on a high entropy seed of 256bits. Mnemonic phrases are encrypted at rest using the AEAD suite AES-256-GCM-SIV with a randomized 96-bit nonce, and an encryption key derived by a user passphrase fed into a key derivation function. Mnemonics are generated using a Brave maintained hard fork of libwally-core.
- User chooses a strong passphrase (ANTHONY: do we have length recommendations?)