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 0xe5c0085d68782bf7e46680355ae604380788fa5f1f88ce685f4ca8c529bef6e5. 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/154b7f9b-24ee-4ed6-bb25-5704fd3e67ae.json and https://artists.proofprofile.net/proofs/artist/154b7f9b-24ee-4ed6-bb25-5704fd3e67ae.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 0x3ab5d8e7385f7de9179e0f765348959a1dc34742b492e30b8be5411fa0432433. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCACW1732199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1cf90dc1758b10c7a70ab8843b3491e571a974080b5c6ee8f55c2e56f4fc93. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:49:06Z), 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/TCACZ1718696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e1f0a7f457c5af296b0c1eb32de2a2bf9c6f9d02b178f4264ce82e08862396. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/TCADB1709248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b87fe29612b33ab0a05d19dde4a782bb9dac19314c3e5917663ee126580113c. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/TCADH1740667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a62b959ec37f99b8a23b7f231bac22383f7e40e91626ea86fdbcc096fe6f0e. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/TCADP1840832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8deffc0256c95ebc7ff8eba1370fb2c07b718b776397d1763b5d8fd30de07e8. 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/TCADT1825130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb27c290c08d68aed8e50d2246b7bdd631d1ae0a6e280191b1c55838a640fbb81. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZDA72572897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99859725fd68db538f25eaffcae0bb84ac52d36c0e93e2763645d19ef9ad614. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZHN61922288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99859725fd68db538f25eaffcae0bb84ac52d36c0e93e2763645d19ef9ad614. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZHN61922288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x906ccf728a0ef37e175993926b813dce46dd07eb26471186160dc110038c9694. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZK6Q1996155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc03c9a8855a46bcb56a35fe1e0e7aca1bec08d22263f24a7d3c9cb4c16d5f4fe. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZHN52072621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02fa902b1163d05b2dfca7847dda214f9070b0fe1ccec12fae655008b406b846. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTBC2340460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa77f53f58d6ad80172b0a3afd61202c6a99f956c7c4dd7ef2209d3574e815252. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/QZHNB2141185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8160872373eddda64b9c1f87e6189a740bcf010a958f4b780c94b39667e8c10b. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZHNB2143914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf500293bf00f0e30441bdb588154e9633043b6c868a575f956117ecc15f72438. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZHNB2143913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc03c9a8855a46bcb56a35fe1e0e7aca1bec08d22263f24a7d3c9cb4c16d5f4fe. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZHN52072621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa17fe1f8dbd1f33401e05aa26c6d086f3da63f3eb48701a44c619edc21ac031a. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZHNB2143912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c239663c6d12034fa7c907683f0f8d00573255d911cdff6b06e02a4011acc10. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/QZHNB2143915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e3cddf663bc023cd88cbace8dc56c30f4adffb3d165ca3a16d1fb05a448e0e. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZDA72577656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e3cddf663bc023cd88cbace8dc56c30f4adffb3d165ca3a16d1fb05a448e0e. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZDA72577656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x856c6db58c5c160b8fab82723c1af90cf590a5f93dacf9866cdf54732b15bb9c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6J2385494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c79abe941a0e0e5cba84fbb1e96ae770eb0789ee3d4ae573dc075acb149a13e. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:45:09Z), 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/QZFZ62448827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d8a725727b7e008cb9a0e0102308c5fc33de93d91b983359f76024baff279c. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZTB72242601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7be7ec86524653e43456d7faef62bbbc7548d3dfb07c802be0bde0687a3c9b7. 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/QZRP42547898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25caf06d829f8ce4e41b430b0175b809dfe60180f0cd8e45ebd442b2a1f08e31. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:02:53Z), 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/QZFZ62064445.