Martina may refer to: People Martina (given name), a female form of Martin, including a list of people with the given name Martina Martina (surname), a surname found in Italy and Curaçao Martina
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x122f6497f7856bda46e3935fd6aa0ed3d5957b2eeeab6b94847ad65c9ab4d7ed. Chain 2 (Bitcoin): anchored in block 954139 (2026-06-17T21:12:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7fe5a020-47ab-4277-be9f-fcc654f9c865.json and https://artists.proofprofile.net/proofs/artist/7fe5a020-47ab-4277-be9f-fcc654f9c865.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).