MailZero

MailZero is a communication layer bridging Web2 and Web3, using an email address as the entry to cross-chain identity so users can receive on-chain notices and assets without installing a wallet or writing down a seed phrase. Most messaging protocols serve a single chain and force re-registration across ecosystems; MailZero maps email, wallet address and on-chain credentials together, delivers notices to an existing inbox and wraps cross-chain messages into verifiable forwarding records.

Signatures verify that an inbox belongs to an address, messages are relayed off-chain and recorded on-chain so not every notice costs gas, and an OmniStamp series on zkSync Era serves as proof of participation that accumulates for ecosystem benefits, making engagement auditable. Distribution via Stamp2Earn began in August 2023, with 50,000 stamps minted in a month and the contract briefly ranking among the top gas consumers on zkSync Era; in April 2024 it formed an ecosystem partnership with Bitcoin staking chain BounceBit, connecting the messaging layer to Bitcoin-side yield use cases.