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Morning Edition · Friday, November 13, 2026Published at 12:45 AM EST · New York
Seam Verifies Every Zcash Block Header Inside a Base Contract and Proves Shielded Payments Without Linking the Chains
The design checks Zcash's proof of work on Ethereum's BLAKE2b precompile, including the 25-second blocks planned for the NU7 upgrade, so that Base contracts can act on Zcash payments without a trusted bridge operator.
A proposal posted to the Ethereum Research forum describes Seam, a contract on Base, Coinbase's layer-2 network, that checks each Zcash block header against Zcash's consensus rules. It verifies the Equihash (200, 9) proof-of-work solution w…
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Part of a tracked trend
Proof-Verified Bridges Replace Trusted Signers
Cross-chain designs keep shifting from signer committees toward on-chain verification of the other chain's consensus, because repeated multisignature bridge failures make trusted relayers the weakest and most expensive part of interoperability.
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