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 0x09f38c0060a72c8aeed1753354e08639f840d4507e9cdbc0b9f76a7e45a8a1d3. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/44ea7e68-3fd9-4d8e-b4d2-3800d5f4c423.json and https://artists.proofprofile.net/proofs/artist/44ea7e68-3fd9-4d8e-b4d2-3800d5f4c423.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
La Verbena de la Paloma, Act I: Soledad (Cantaora, Guardia 1, Guardia 2, Antonia, Casta, Susana, Vecina, Vecino)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5b1c2c291363515982be3c3daf5102524834efd8373aaaefe7cc654b59d41f. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/FR10S1754991.
La Verbena de la Paloma, Act I: Gigolettes et Don Hilarón (Hilarón, Casta, Susana, Antonia)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eca96a6b8d16323c752b12350bee6f7ed3a36c25575aa96f5b3682d3daf99db. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/FR10S1754993.
La Verbena de la Paloma, Act I: Mazurka (Casta, Susana, Antonia, Hilarión)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ec316ce36ef3305b0a58b36b9ea069d2b80944f3d32d4f7937d251615bd26d. 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/FR10S1754994.
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.