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 0xce550a5ee10d05509f3abc594087b6179cacb3aec854d709e087cc5fe14b8397. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dba77b19-e5fd-497b-99d0-7ff43dac2c6f.json and https://artists.proofprofile.net/proofs/artist/dba77b19-e5fd-497b-99d0-7ff43dac2c6f.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 0xd76699bfe2e3d137addd5840faed81731886cb15b80dc755bb3c2a38807a621b. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/QZK6J2244243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7096558055db3cf03644941d200d9351f417b0148bb7c6fcbc827422c1d0beb. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZK6J2244244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb95ca2cfbf00691965aedfef0aad885aa3ac0553d99e08471c6f33309814aa. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZK6J2244246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c58fe83003d2cf419673296b577b0b193066ae38de8f94b5c9935395d53804. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USA2B2319114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33743e9aebfe7544be1142d480725f7a5a3b5d5a57ce239970cc79240f69de3d. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/USA2B2319112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b877ee8e041eb7ddc651a2811659082757cb283d42488b58a5e3488ffc0ba95. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USA2B2319113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aacd0a56f9e6b96cdfa05af132582289e08127f494388929e433906ced37218. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/USA2B2319115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba333fb8f9c29b3358dfe9b356aca42b6f3c52a24ef44a780c5342e7406977a8. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/USA2B2319116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10889a51f442bd595c356984f0cb24b83918316097ccda769e8f9180d9ad3f36. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/USA2B2319124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d36e4e4691732ff328330a5b5796c68e0947ff8bf55ae6011ec378d74f2aed. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USA2B2401932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3dcd889ab69f16290f505422f0c5a5a8f29bcc1ac67569230498efe0f4898f6. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QM99V2500601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf963f5f4b4fcc0dd998850e01320e071fd7625df2a80d12c75ef19180bdbee9c. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QM99V2500602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc27fac1c1300881dd46f11d2525673080f8432600ccd1c07bad100c901238696. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QM99V2500603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe62431f7bcc0a4c232f274a666f06fb62041406d8d337999fd4163d6f41890e5. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QM99V2500604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f90bdb1682c06b50545ac4a70664004bcf0a78741d061c30ccf0af56a5a26e9. Chain 2 (Bitcoin): anchored in block 958676 (2026-07-19T05:43:13Z), 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/QM99V2500605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab0b414c9995f24f9fd8589037597fbc542700a7f36b8dd2235a6d06554b161c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QM99V2500607.