Leandro may refer to: Leandro (given name), a male name, including a list of people with the name Ero e Leandro, a 1707 cantata by George Frideric Handel San Leandro, California San Leandro Creek
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 0x9c80f8a1cafb5b1aaf4616839b4ab3f344698010f82ab90198c95e24a94087f2. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ab6f619d-02de-4e04-81b8-7661f76fe4c4.json and https://artists.proofprofile.net/proofs/artist/ab6f619d-02de-4e04-81b8-7661f76fe4c4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).