Bako Safe

Bako Safe is a self-custodial multisig wallet built for Fuel Network in 2024. Its core idea is to place multisig logic inside Fuel Predicates rather than conventional smart contracts. A Predicate is stateless executable bytecode containing up to 10 authorized addresses, a minimum signature threshold between 0 and 10, and a b256 random hash that distinguishes identically configured instances. When a transaction spends a UTXO, the Sway bytecode verifies signatures on-chain and counts matches, releasing funds only at the threshold; validation also checks the transaction identifier so a signature cannot be replayed elsewhere.

On the signing side both Secp256k1 and Secp256r1 curves are supported, the latter matching WebAuthn, so users can create accounts with passkeys and biometric authentication instead of seed phrases or browser extensions, or connect an external account. The companion Bako ID product maps network addresses to readable handles, and batch payments move multiple assets to multiple recipients in one transaction. It is categorized as the native multisig and asset management entry point of the Fuel ecosystem.