Alberto Rivera may refer to: Alberto Rivera (activist) (1935–1997), Spanish-American anti-Catholic activist Alberto Rivera (equestrian) (born 1954), Mexican Olympic equestrian Alberto Rivera (foot
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 0x655e8e76c73477d2752011187b0d0c74b5879e8ddde2d1c6d02bf0bc819b95b1. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ddb4d80f-54d7-43bd-9b15-23cf4e4b5be8.json and https://artists.proofprofile.net/proofs/artist/ddb4d80f-54d7-43bd-9b15-23cf4e4b5be8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).