The untitled first studio album by the Spanish rock band Triana, commonly known as El patio, was released on 14 April 1975.Page on Discogs (LP first issue) At first it was a commercial failure but as
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 0x547a9505ec64577d7aff4b302fab2cf8e5c55589487faccf6d3c53a11a167ab7. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/27f902cb-2ed4-4445-9376-26d08daa7a76.json and https://artists.proofprofile.net/proofs/artist/27f902cb-2ed4-4445-9376-26d08daa7a76.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).