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 0xe32b2b74b4e965fa40f7ff561b39121bc4410f40dbb4374f727e2e7c00418834. 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/ebd9cd71-18a2-4a19-9c8c-6f121e61414c.json and https://artists.proofprofile.net/proofs/artist/ebd9cd71-18a2-4a19-9c8c-6f121e61414c.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 0x50209ba4e7cb39e922502422a5f94c399427c1e3c63b587bb1b2e6af53a33de1. 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/GBRKQ2236296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec74f970141baf05a1a1d184abac8c30c6dee6a8081d9aef5c4a47c0455f648. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/GBRKQ2169105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3003b81db70b7bdbe18e9205207b710f7da92c0d697434db54912e0e28471d0f. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZZEB2340771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08b64711cdeb115b59360ef8df53bf69919f4472cca707cc8556380832ee22b. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBRKQ2456588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0fe33311c463ec02e1784846bff52b4542923015625e35e894fb6332b266438. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZ5FN2375619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ce285ff1fd013559a6081a01f7006e5dd2fa4ea1d4c42e898571611361d688. 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/QZTRX2239132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3759adadab296ff6e95ae4b15d99c01572392326a16f56105a4894be017ac159. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBRKQ2215988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x171996c2dcd35daa75044e25ece926a28edcec6aab29f6cac6b4b95948c85d9b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBRKQ2215991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ef8a9ec3d1dc10e327f2f26fe1e3efa603af574b36da79a80ea5291f1acc42. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/USLZJ2281716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58159836798534fb6164384dcb89f4b6a4d0c2ad850bce2c19e8b6f424482734. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/USLZJ2252084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3357e1e03b10672370e28c753b7ad2301240bf34ffb9f518c113afea9833b4c3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USLZJ2218071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd707903b35a02713a473dcfee22383f08f8c686064c74365e31b0ae39ac74700. 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/QZ5FN2283122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb015707294f7d14e06066002391d221321ad37a610b15bd4a0b1346c3300cdb4. 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/GBWUL2173247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a56ee5c2c3d446566ba56c228b8ceab79985fcd463440632d24061f32cd9ee. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBWUL2155645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96408f2237962ec2952da6bb54f9817f35cdc2b4271b83f7afb1f9a2909c96f. 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/GBRKQ2129039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6547a492d29128b7cd11b4aaa664b2a4aca3fb7f7041626c30cffe94e817dbe5. 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/GBRKQ2105888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61db40f01073f30ae62582cea22e0a9d269bca0fd1cd55efcd52fb663bc5a28d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZFZ42159578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x476309f9a62bb889d3cdedea141dc0f03786a78f7c8a2fd0ffb2ceed19d54a53. 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/QZNWZ2049593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a4b04f7a5bf37851b7aed1d83f6298326daee9e4028aa48ea6d3c8475cbe07. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZMEM2037927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x127e2c7406b84c6f2e88793d75ee7d4a902f0fb8fcaa2ca6b65e379f6780f9c8. 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/QZMEN2098578.