Alberto Ponce (born Alberto González Muñoz; 13 March 1935 – 26 July 2019)Summerfield, Maurice J. (2002). The Classical Guitar: Its Evolution, Players and Personalities Since 1800 (Blaydon-on-Tyne: Ash
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 0x211832683dd9f81dc92bdc232203682f08e304e11ddc030f75ec950f12850646. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/973fbb70-a587-40f2-8f1b-f3e26afafcf2.json and https://artists.proofprofile.net/proofs/artist/973fbb70-a587-40f2-8f1b-f3e26afafcf2.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Rodriguo, Falla, Garcia : Chansons espagnoles