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 0x693b763dfce253934e9003a4e605d93143607ea302d59bacfd30314c4513e089. 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/2d80d083-69ed-4a39-a76c-67ed8af78a71.json and https://artists.proofprofile.net/proofs/artist/2d80d083-69ed-4a39-a76c-67ed8af78a71.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 0x35287b3fc72ddf3eb47316d130880ad08ac9adb21ee9ae4503f8a2b844d91e9a. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZFZ52073806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6904841da22dd6e98c1fa7d5518fcaa16c9fa8e1b104e3690c2943a2ae659b63. 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/QZFZ52073807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728a2931910952f9a9958238df50115d083b987cc355b0c647d902815330a4a7. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZFZ52073808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x682aaae9b89398a4dec4eb29f37b8d2787aacdc88360767ab3efefb17c75b6d2. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZFZ52073809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb9c5b62b052a6f9d79a00c82a7c6977c65d9da801f64a4e04dba058768e9f8f. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZFZ52073810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb37a42921224bf65d78f276120f47dc3951eb963880bf47f8079738cb7a011d9. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QZFZ52073812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d171fddc7d15eccb59e313ba8c4d82dfd910f0f7f6ca3b5a12e3a0a9f49206. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZFZ52073813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84976c75fa9ba55ff83ebe46e7e00e05396535eea81da6eef692cbbe5531fc7. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZFZ52074450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61ab9975c96f3476b929be0c0876c715e44005a7d79d512395aec552acc6fe1b. 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/QZFZ52074453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe413f7e8fb9931ff698a17a7410735e98334cdd4c01422f96497b31967d58b73. 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/QZFZ52074461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9980a85a2728daa722d7191a4fac64f36081cc33bae802109b880912eb72b6f2. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QZNWV2153042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1400c566a546d9475e5c96cadb41248342154216a0c23a8a3ca412b2c53ae0f4. 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/QZNWV2153043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ba3be97eeaad7be8038f75b69336e5ce7478901530245ab530889482a90edf1. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZNWV2153046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc01a9ece1c07f9e7465877336201431911a987b475c136d2ea07b64dd4826732. 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/QZNWV2153048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08e88842ed0f354614d068afa79acd072ff9a2b92f0f7734d8a70f4e970f0ea3. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZFZ32555003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x023ce8ebf27c1a21f217324c0ce0d1a07fb795059ae17cff87f2ef42cbc0c5a4. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZFZ32555004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f4e4c0eb0bf7c11dce841f86bb89c8bff650b6cb29dde34b226037c891ffae. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZFZ32555005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c1f70861647d7d1cc62b5fc59367d25706cc9baab08c3b380424aab6b31d0f. 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/QZFZ32555006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe43eec9a2b13504ca7d564dd8fc2ce5caa4b84e1b963d3cee4a47b2f87c0badd. 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/QZFZ32555007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc5da0eff2eff613310bb91908d32f1a083109d92b954d075d59e28ac5cfe35. 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/QZFZ32555008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0616a5cff03170539778133f657fffc062d03e49f5794c503c2e4548074b899. 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/QZFZ32555009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa27eed426d79766449c4de7cf3e7085931a718a80f5220a7a54d02b150d230df. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZFZ32555010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd017558b4e342a0dc2bbbb5d8714faefad62a3244ac273e050d223c821ba047. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZFZ32555011.