Ethereum L2 BB84 Drops Signatures to Counter Quantum Threat
- —Each account is a keccak-256 hash chain, 1,000 steps by default
- —Front-running flaw in commits found and fixed on October 21
- —Addresses truncated to 160 bits, leaving roughly 2^80 quantum resistance
- —Withdrawals rely on a permissioned proposer; chain falls short of L2BEAT Stage 0
Why it matters: BB84 offers a concrete model for post-quantum authorization on an L2, but without fault proofs and with a trusted operator it remains experimental.
Source: Coindoo