David Rivas Rodríguez (born 2 December 1978) is a Spanish former professional footballer who played as a central defender. He spent most of his 16-year career with Betis, appearing in 244 competitive
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 0x4f88c2ea0a38f68ba4d763f73ac7b917e7bd8277510bd63fc5ccb0d4c7a468cc. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b0757454-a146-469d-8887-1153d454d046.json and https://artists.proofprofile.net/proofs/artist/b0757454-a146-469d-8887-1153d454d046.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).