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 0xac1997d8a375261f8f2a14701fd80b57f04579c3c0c8ca02db4a40e7d62318dc. Chain 2 (Bitcoin): anchored in block 953706 (2026-06-14T23:14:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7bfcc267-c15d-4019-825c-01cb3e8fa431.json and https://artists.proofprofile.net/proofs/artist/7bfcc267-c15d-4019-825c-01cb3e8fa431.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 0x143707fd689c10a028a8a3e4b884293ef6dbcfc56a7207205916f2dac97cc5c1. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZFZ32542156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7381384da488a0dea1c44970b68835830d8953c805c97368660a13898276f6c5. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T05:03:25Z), 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/QZFZ32542157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d22b2fed05c541700f88aacfd4a095835510fc36ca8cd643382f99faa7ae101. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZFZ32542158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb0e434535830ade64994266abb25f6ed2ddb2a88e83698fc0488ff1e97c93d. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZFZ32542159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce87ecebacce68c53fdc289772af620f496f9e49c0dce4099812541caea44c2. 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/QZFZ32542160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10514fa915acedba7d1f741315e2b9928efde68e08a578c19a18c236f3f14165. 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/QZFZ32542161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34dfe3f91f15e105f53f5038c1f0537877784f73cc695f9e75d7e3afb8644ccd. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZFZ32542162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a8471a355f385bded8fd8444159337b7e0cce3a6be43cb3c9be52362f0b9ab. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZFZ32542163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff014f6f45a2064dea97ea341ffb893a603ccc74b18588991172cf82484c75e2. 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/QZFZ32542164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d1d440839e59cc1fa9ec55bace43b490c495e5f4247c3de813e333b48e2cf7a. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZFZ32542165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x159e2c07519a2618b37c5ecb7870796c1f74f7833d780e253f5932d3ffb6f7a9. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZFZ32542166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1acf161a463186923ad098398ff74f6bed427c4a92d57e4d14d8219f6dc7f1c7. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZFZ32542167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcbd134cc8a2fd2ce82e5c94c30de22137770b7aa6e98241ace020d247483311. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZFZ32542168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9a801874a97b9e726a1114422410d84e359e41d790c075da5a1cfee3fd98cc. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QZFZ32542169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f85d48004beddc1d596b2ef7c55c5fad268b8cde641824e40f9ba18678bf83f. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZFZ32542170.