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 0xaef5efd58f9d9df8c4c789e1f043f33c106fb35ea3ac05bb0aae1291af140a42. 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/61516773-72f4-42e2-a581-a63fed46b93f.json and https://artists.proofprofile.net/proofs/artist/61516773-72f4-42e2-a581-a63fed46b93f.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 0x60416873da310010d9df4f018a312e747648e3b682910021898a6c2dac997339. 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/QZES71995422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec571a7d131193ad9ba1e8b379e8a4f1d715cba81584f934fb915690d6476ce8. 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/QZES71995424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc9792664e6f6fe6b37cec19817b585dfab8aabc4107615ac8e57207fe9b33a0. 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/QZES71995426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce1d3df9d2ff625bc687e680b4b8c17f3e826876dc0207e1bada05a2c2c64d9. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZES71995427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x374129946591134b5eaeb2bc2303ac116150c4dd5472029ce839290eb242d649. 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/QZES71995428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b8a9aa7af998dcb05e2206ee75b6b509f0f3a0bbdeb43b3caa47cc11622f62. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM7282068436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11be23ef45d939c15597f4f251c6ca5547728ea81f128a34ba5d5fc1c9a95fb4. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QMBZ92015863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb247ced6c2913a9973d0df7c6c765568f030403cc42e133d627bc221b1f068f8. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-17T00:11:43Z), 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/QMBZ92015864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c09dc2e8864082b27865b3f9a8a908406531bd9634160b987cdc90e273ce4df. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/QMBZ92015865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2731daccc73877efb87164465326edddc95cbc93d03e4e32d9fdb4bd1b8e72cc. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T22:14:58Z), 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/QMBZ92015866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8df35a04fa4b5912139a47bb032d1480bcc570f27d9c81164ac101751fa01d10. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QMBZ92015867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eabca86cc62f049be7ed9c229be4900f3f238cb559a3c44beac0a5ae0f1ae2c. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QMBZ92015868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c2b9d79c36f04ec228a777ebcfcf62a4dd6321d5048b4b0bdc5ad7898d4a8d. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QMBZ92015869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28b7167467caa05b409d3b210a67b13ef31d7e145ed4a46a7fa23b46e6f6fcbd. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMB622401521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee8d566106328311c0dddf6e98afdc0b847e30c5eed844ed0ac00dc09fc02ba. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QMB622401522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02655f79244af817d3e1b9ba7d8058cb71bb0b38317523ab9f8871532da0405e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QMB622401532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28b7167467caa05b409d3b210a67b13ef31d7e145ed4a46a7fa23b46e6f6fcbd. 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/QMB622401521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6074da8253490b603dead614cbb1fff841dd83ea501a3b5892d30cda47728f6. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMB622401531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02655f79244af817d3e1b9ba7d8058cb71bb0b38317523ab9f8871532da0405e. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QMB622401532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28b7167467caa05b409d3b210a67b13ef31d7e145ed4a46a7fa23b46e6f6fcbd. 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/QMB622401521.