Passage Bridge

Defend cross-chain bridges against Qubit-style phantom deposit exploits by reconciling event logs against physical vault balance deltas and independent multi-relayer signatures.

Rescue stuck cross-chain transfers without risking double-spend exploits using destination-chain tombstone state commitments and automated EIP-1559 gas-bump watchdogs.

Protect cross-chain bridge vaults from compromised relayer keys by implementing a linear-decay rolling window rate limiter and automated on-chain circuit breaker in Solidity.

Prevent cross-chain replay attacks in Solidity asset bridges by enforcing strict EIP-712 domain separation, dynamic block.chainid checks, and gas-efficient unordered bitmap nonces.