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 0x115444502d2d59e2e9eaa5ad4ad9337e95081fc49886a854d17ee549e0a6ed12. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/75a96464-d91c-4690-ba8d-33cdc4a818c8.json and https://artists.proofprofile.net/proofs/artist/75a96464-d91c-4690-ba8d-33cdc4a818c8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
El Cantar del Arriero: Romanza - Remastered
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 0x3453c859e2ec07542eff27e78ed5e6a4f6fdccfe39b8042e23f061ff7807275d. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/ES5271402001.
El Cantar del Arriero: Soy Arriero (Salida de Lorenzo) - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb777aec2abde726f00af10e26a3b7874983c296c6a4c12d01fd553808c14fb0. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ES5271402002.
El Divo: Soy de Aragón (Pasodoble) - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfccdc49f8d02ff6fc7bfdc9e2793935cb451c459abf340b50d8b8c06a20802f1. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/ES5271402006.
El Cantante Enmascarado: Raconto - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf931ed4fa7a81decbb7979800ea3e2882a5ab2551c4894da8d86cf046fbf6cc0. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/ES5271402025.
El Cantante Enmascarado: Brindis - Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ba2a0ba4ce3284e6bb93f91afd3948fb4784e4beac9bd05f603b2ca4924bdc. 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/ES5271402034.