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 0xd99f6a0740dbe9253daa31e013aced77ce54328ae9fedf5e9e5339ff9fa290ca. 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/b1b54b6c-65c8-496f-b46d-532384d1d04d.json and https://artists.proofprofile.net/proofs/artist/b1b54b6c-65c8-496f-b46d-532384d1d04d.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 0xf0c22aea098ed84f2dde795a6bac9fd5629b2fc505ce3dcc6baf96d78d4d8617. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZHN52218120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cddd4aae4bc107077afaff7c2f98461f8744b872000482fd15abbc75fbad875. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZRP42229208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e547949651471f7fb35665392da92a2c029a4f2b95e57b38e2d290fd34721d3. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QZK6N2235776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0510d61b01d878aeff81d11c21c1e1ffab796469d76be3189facbe10b3558872. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QZFZ62354169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7019e66917cf360a27ead1f3f804d8ebef8b2a31440e74b05eec1b0a9c7b4dce. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZFZ62354170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ecbefe6c53f7fee9667db0654a2e70addbcda1c9d81b03173024f25da75f3dc. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZFZ62354171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe5cdb8a0e0340b8d98c5296a28d060fc1d0c149dafbe264d50caf7195b7ca01. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/QZK6G2357584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b3f55faadf7d8e1a8a1ba49a1980fbe90a6236b591a04d79ac32bd1599c2498. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZTBD2391782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3bc604a736c2b7c481fd903e4e916fea496bfc793babbae4150a2228cbf131. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZTBD2391783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d007b8e4d99010ede56d3d32cce5ef3cbc9f65fa5ee119b18650364e84e2493. 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/QZTBD2391785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5cf7fcda4ae596496ef1144b4fd681ccca4d54cc32d7e65767db5785c901e4e. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZTBD2391786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4070ef0ed63b66a59cdff6284dad418fa00f8c88fc3bdbcf34cd230d0b4e94d2. 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/US6YC2405242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808156a788afd2cb33187a4e7dcc1e223f757af8e818cdcf8565cd014c411b1d. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZNWS2411054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9817e693eeffd37c9d5f3a4ddb181cb0303e18ff685bb71059360719e69e10c9. 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/QZTAW2442704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4214299805e5109e41f7869bfcf64646acd04696eda6c9b01279e2a51565c2e2. 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/QZTAW2442705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa882009db5ddcd3d98a7f466c0134a2f1e1739cf38a58e34afb64ecbb7a3f025. 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/QZFZ32470072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc9f5090931a6ff56c780e59976bb8f896da1a7eee3ed8fd411ed019f68a4b71. Chain 2 (Bitcoin): anchored in block 958678 (2026-07-19T05:59:57Z), 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/QZTAW2442708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf6ff267b2bdbb6367b024c4991923ee60089215c2d33849076c32d5689bfda6. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZES72467747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51bd437949c6294c12ab815f5b393b407c837892e3717083db7381c29d38aa7a. 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/QZTB72570476.