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 0x5c126ab75098145f9623f5a4a1c39367f04b1811556255c5d0fa9f55e4bedf18. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d9bc82af-a238-43f3-8f1b-279d8f65cca4.json and https://artists.proofprofile.net/proofs/artist/d9bc82af-a238-43f3-8f1b-279d8f65cca4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
La Verbena de la Paloma, Act I: Chanson de Julián (Julián, Rita, Hilarión, Sebastián, Tabernero, Mozos, Portero, Portera, Chœur)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0xa7aa1eba2ecf74f3d3a3fee33c587af22ab741dd13bf758cda0871e5975f1521. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1754988.
La Verbena de la Paloma, Act I: La Virgen de la Paloma (Chœur)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ebc37819da252a277207c8fc0e8d4c887a7714218df7895eedf6891bf426ff. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1754989.
La Verbena de la Paloma, Act I: Habanera Concertante (Julián, Susana, Rita, Hilarión, Antonia, Casta, Guardias, Tabernero, Sereno, Chœur)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b00d830f6ded3d22da89c1a687a132dcf3b9e3d81e093962f57da98d38ece0b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1754997.
Tres epitafios: Para la sepultura de Sancho Panza
Orquesta y Coro de la Comunidad de Madrid
X Aniversario del Coro de la Comunidad de Madrid
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe634d178279a875a6751481ead05174debbf23be7b5f69f0c2c683536bdbee20. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB92311649.