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 0xefbb0d35e9cc708c60f423d0e5c60c4959570d4ceab3708eecdd4d52186c8e9b. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/502a39c4-4cf1-4aa4-8822-ed3cd644eb61.json and https://artists.proofprofile.net/proofs/artist/502a39c4-4cf1-4aa4-8822-ed3cd644eb61.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x4a13e2a3f432f5d0672332d7129483ec334a14e71c20bfd36d5b8aa3bdd1dd51. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NOHLX1757130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255936469678ca2398fc0fe17620c1532f3037ef4eed76488d7a09d15578e282. 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/NOUWG1501011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c189de854c4e8469df708f77afdb0e0835d5a485e9b5eb9a848ee9c5dae828. 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/NOUWG1704011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe287fbe507630786a3c666647fbb2c12cd1094c49e33461c61d883151f725347. 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/NOUWG1705011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa30656f790ef4b4c8f13c59f4d91f06eaf3d648e4a1e2370c00dca4dcbf23bee. 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/NOUWG1706011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18e11f640918ed5f8fffd4ccdde63b997d3309895f1991928ff92a0d8b1b39c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NOUWG1708011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16076d299e7a5222072f76919d176d2fe0d478a65ba1df34300d81a080fc5fe. 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/NOUWG1709011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde75f5445187da0baef16f2461a57445e08b0217c34c38ecf0118897d4115259. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NOUWG1712011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x137520a9a297e35cc0df68c3f0bf18eb4bf81b6de253354a4787e954870a9756. 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/NOUWG1501030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6c7e7acf29b0c70dd81ce78f0f8aed44d564fbd582cbbf2f45c9e129331042. 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/QMPKX1508053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf605cc406575f965f8750367badd866466fc809f40ade2a784138410a9bbda1c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QMPKX1508054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27492feba1ecbe88eed5696b5158459b59fec3a46d365c6c3addb999b8ed6419. 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/NOFFM1931010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cbf6fe9e3cc363514d42b010ab5b1d40811fd50c061744bffba2aab34b2ded7. 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/NOHLX2340080.