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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f319f1f4109bd279fc7f5061b0935b3b003000738fca7eb390006654ff139f9. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c9fa3696-f7c6-44ce-89e4-8bb2dec2b401.json and https://artists.proofprofile.net/proofs/artist/c9fa3696-f7c6-44ce-89e4-8bb2dec2b401.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f03be2870f7b5e7da697a16cf4155549d3d6a14fc3e3941a3f2cb8a3faa3408. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEUZ32000549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84d4e892ba6cd47ad9aa222153235896deb419fe7afecfc2ff8340ff16d7d5d8. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEUZ32000553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9142d5af6f13c1bf34a441c77681500860ec440acb3dddcefa74bd14b5bbcd70. 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/DEUZ32000554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a307309f03c53e8d722e0214dc21067aa568a45c2ba85368af366dbbaed1e4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEUZ32000559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa59c05c003fb3febc822a34635d1e26cae2bbe5148d2fdd48dd52fcbc391695. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DEUZ32000551.
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 0x3308c06c2d7bd77249418f5c6ef88c69688b01fbcaac924ef7a2a8bf8c963944. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/DEUZ32000552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36a3d064f8d935cee2d07391c88e4337a300fcf830b1d89102fe9512af5a15b5. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/DEUZ32000555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ae9a0f6867a5995c33ec42fc32def1d5a023e4d44da2f3559e3a47bd65c7568. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DEUZ32000557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd100b08a504fc203c161e1c07399232816fc6a006c173f3794ae5776aeb57b4c. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DEUZ32000558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0c228023770c937375b08e36096430de55e92224baa988504875639dc3552a. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DEUZ32000560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f1db5ebb778fa570de72d7f9e3a7df35c1946dcda4d30505a1048a2603e786f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DECA51600289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b32fa628326611bb3a703b1d0437bd15e41ae877da31a881730278ed9945495. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DECA51600298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a6a83fb54ecd57f40e1a0b6658b6bffdb6273e0fea8d7b164bba208f7496c26. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DECA51600288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd629e1593398359f26c22b638b1df2e9d38f12229a6785deb06f09c9156da66. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/DECA51600291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed40675b9ff4eed2d24508795659b4aa4b0d07fe6dbfe5992e677acd609c720. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DECA51600292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54e8d3d805724d3d7329d189e0edd0cb3bae0abdd195e9034836ad99ea829bb0. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/DECA51600296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd28fd8cd66fa4a69d030db4c1db5132f49d1bd86ede7e9e8ee81cc162c81bb2. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DECA51600299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5212e669e3e811ec7a9c6488a817817355384d02f7b7260339a62475dbb86c63. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/DECA51600300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7008eccf4c61c1ef1d12c310f4d15300c44a83aea5696972f3239c2394fd5c8. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEUZ32000531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a687c6f420e89817064d3810aff9a8b8dbe532dacd0d44559409a45b312892. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEUZ32000532.