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 0xc821117ba5c819a98c91b91e6f48c961d5aa68dc7af302c4ce1a0357f499286a. Chain 2 (Bitcoin): anchored in block 954134 (2026-06-17T19:41:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7f6e9381-ef29-4699-8729-b72e216cb39f.json and https://artists.proofprofile.net/proofs/artist/7f6e9381-ef29-4699-8729-b72e216cb39f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Isidro Infante Presenta Cuba y Puerto Rico "Un Abrazo Musical Salsero"
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 0xe050932e279b8df3c6f602f500d5c50e43b604ea1790f79e48d23f72267bc03b. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/USASN1700086.
de D.J. Agua Salsa Lives in Cuba: The Ultimate Collection
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa65ac584a5439d2243ff5e0fee9fade8fb5451c7f6e963b13fb49ed51f0ccd9f. 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/QMDA61419919.
Cuba y Puerto Rico: Un Abrazo Musical Salsero
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x634916101b787edb1fd71556273d6e5b91e3f14e8c1465cdc2c474743fef68dd. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CUA021711977.
La Masa - En Vivo en la Casa de la Música de la Habana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517d095a1f89dfc91e40a3d9a4a2a476be05c6c37f801bae6e450470189fc9a7. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QM6P42038860.
Popurri - En Vivo en la Casa de la Música de la Habana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d533c5058231b98c101d357910912da1a919bb53915cbbcab699864a629384. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QM6P42038861.
Esto Está - En Vivo en la Casa de la Música de la Habana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca5b85a19e06c9f034d8bad0046cf8e406dc6b5b02c6091e967d68832ec53c6. 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/QM6P42038863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f3a8fdc6db2bd2fd42dc5b2346f7fa81847577834e0e5b800c8a7bdd73b2a9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAHM2388055.