Base bridge

State layout

• BridgeState.merkle_root — current pool root
• BridgeState.program_version — version handshake
• Per-nullifier records under a shared namespace
• ValidatorRegistry — authority, totals, minimum stake

Instructions

• deposit — lock ETH and emit a commitment leaf
• withdraw — verify proof and pay out, gated by expiration_slot
• shielded_transfer — record nullifiers and update root
• register_validator / distribute_fee / claim_rewards / slash_validator

Events

Every state-mutating instruction emits a typed event. Off-chain indexers reconstruct pool history from these events without needing a separate API.