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 0xe95ef379a900f2996bc768c3303952b1bd5d2800495092c982938244ea0fbeba. 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/bfb11d4f-35e1-45ab-918d-a25dfbf651f8.json and https://artists.proofprofile.net/proofs/artist/bfb11d4f-35e1-45ab-918d-a25dfbf651f8.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 0xbbf927fd736bb6f91b4c7db38d4e10d10f10c6cd75e24e27e31a38c03cfc60b3. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZWFL2377844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57167af01a8da508c214cdd88929485e8e2fed2392b8025dee182aca5affe33. 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/QZFYY2498941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaacdbf0e7e42ef0810e4ca75c49db4d9314fe7b11f7285747abeccb5be0b3cfd. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZFYY2499611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x259e4d165db5825e2d1d0e3b48291084bd96d531c709dadf9ee712162b65d98c. 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/QZHN32419150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac69aece51e4d31be610b2553d8fadbfdbdb2330075d8596c8f5ef2f41e1477c. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZHN42490711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa338b9c5bc74b5222aa76e914de1c9646bafac65a3dd58f6fa7e3a921bf1cb2f. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZK6M2498368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2590a6369e53fbcc0e967d8cdbb0349036515c2a510c94a41f3b420706c06253. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZK6G2472321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf939e8565fd504102a732c53580af177c85078be2211ff1fb3eb6f07b50afb99. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZNWR2489362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb1a3a4bc0634c46a8b3be00791c1ceb3587a4b22e56a699f1b703240a50090. 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/QZRP52416761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec65946b4ebf3bfa8126ab559e81efc74f35f17d74bdbb34c389ae33423a2bf. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZTB32434653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda7ae13fc137fccb829c70797839aee9c679e8829e188e74da0362531ac1b5c5. 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/QZTB32437210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d7958379fa2a43ac01d38b0ef8385858768bc6a6f42a7034a84ffb5d43aec2. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZTBB2488678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcd4789dce86a1867a6aa575d233b6dd44c38cd25c12472cc2565c05b1e46192. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZWFK2420068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d04386c5087843c25f320dab9e255d66a43f2c5587f00f8c07a7abe410ee22. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZWFR2480838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607e1deb24a2ab90cf8ec3acabce4dc505e4588b1e393380390805a8b7642c6d. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZWFR2480839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1c3da4439e4434231c560217291661c51d49b305ce92effe0dc9bf18c9720d. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZWFR2480840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ced6faa621fa40168b33e32469e67a254803d3e6def0e03d4445fe3ca5219c9. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZWFR2480841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6114f4c5dfa28deffff0430ad3bf2103353c62df0e5a1633b8da4c5d540c8c9f. 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/QT3F22497299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b8142a5b4944c0e3b235b1a9f9172b131ddc5b0a335b28131fc8394fef9ccc. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZFZ62563083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb88ec339dadb9afc7c25b2b98b0cbeeb5653f2a141556cc7bded02ad1eccaf8. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZHN62525148.