José Guadalupe Cebreros (born 10 November 1947) is a Mexican boxer. He competed in the men's light middleweight event at the 1968 Summer Olympics where he was defeated in the first round by Soviet fig
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2269eb20fc764b1d163858cd761a8ddc49d2e316021c5319491e527ff8cbdc53. Chain 2 (Bitcoin): anchored in block 954573 (2026-06-20T15:45:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b59b6c74-4177-46ee-9a99-30fa0ed8a0a0.json and https://artists.proofprofile.net/proofs/artist/b59b6c74-4177-46ee-9a99-30fa0ed8a0a0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).