
WITNESS Protocol
Witness is a trustless timestamping protocol that proves when offchain data was last modified without paying gas per write.

What is WITNESS Protocol?
Witness lets developers and apps commit to data hashes off-chain and prove the exact moment those hashes existed, anchoring batches into Arbitrum and Ethereum. Teams use Witness to timestamp legal documents, AI outputs, and software releases, getting cryptographic provenance without paying per-record gas fees.
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App store listings are independently reviewed and written by Alchemy using a combination of inbound submissions, editorial research, public project sources, and third-party directories, including ecosystem data from The Grid under the Open Database License, DefiLlama, DappRadar, Reown, and chain ecosystem pages.

