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 0xc6db0fe639e774a660fd7e05d9394ca8cb59ec87862cd0c1baac6e9042243c1d. 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/32d63e77-36f3-4428-add0-461c96933d8e.json and https://artists.proofprofile.net/proofs/artist/32d63e77-36f3-4428-add0-461c96933d8e.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 0x617d43580b7c1bf2ed55b4584ecc125e8a03295ce6b84315b4b7480cfa2346d7. 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/QZK6M2187122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe05a22d49d048ba0b9bfb3d7bea2a68dc994e425dc10fe4cb1ea0687e3b0e379. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/QZNWV2192107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc520e6a8492e5d0965737d7ac0381899ee8b262a24120da603e40c407dcc6e8b. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZNWZ2185793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f7651f2a0fae33d765f85c118e77b174f36ac3cea1b8ca5838b4814a254954. Chain 2 (Bitcoin): anchored in block 957695 (2026-07-12T11:16:12Z), 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/QZES82372479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896607e9063c804cef5528c1d778c4414b9e6070ab2de6c0c46a4e96d442f36d. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZES82365360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd129daa9e463735097897857df718810318e661e7632064fd15a34f2721574. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/QZES82365359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd712a59695e93149c1959a2df3172cd728940def02f6414b1db4c4c65dc658ef. 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/QZES82374091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb2d129e3db14e8903f21d564202f8e29225e65cf3bbad590fcee5a105a4b21. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZES82326955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77665134baacdae69735354df8c138423e000d92bc7694a104e60babcd29e4b. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZES82374093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8f1655399450b6376a868b54c1c42e2cc01ff6afd8a19fee7d09dd3e410b72. 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/QZES82365361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca41c15eba4ee18aa3047b886dba753c82b9d00f02ef35180af106fa3332e53. Chain 2 (Bitcoin): anchored in block 957703 (2026-07-12T12:26:40Z), 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/QZES82365362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e8c7dbd9e3a6c93691a608d3325d17f364c802cc5e06a6322fd9d35da568ea. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZES82363584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dd9c164fcadf3c1f421e99c1cb1e6345baa7a35929f9e50a878adbc08dc5287. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZNWZ2489266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b82f35a411d3263f9584a298e9fa2b19972f8530e2798e5037873ad2d919be. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZK6K2563050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a79879a9c37929502de53522b317af454ac97362c06b7897d734fd17ed376ba. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZK6K2561136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e51061567c9fb7eb9104742a06a2ddecc6ad8a298248b3086f107aaf0a05414. 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/QZK6H2276311.