Description
OpenTimestamps defines operations for creating provable blockchain timestamps and verifying them independently of any particular server, vendor, or centralized infrastructure. Its calendar servers aggregate document hashes into Merkle trees and attest their roots on a blockchain. The linked Digital Gold Institute interface lets users timestamp files, upgrade .ots submission receipts, and verify attestation proofs using free public Bitcoin calendar servers and public Bitcoin block explorers; timestamping demonstrates prior existence but does not prove authorship, validity, or truthfulness.