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 0x84a2555d2a7edf7c9399b9b590d45b4b3d280023055f356e82a5271326e8fa6d. 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/908cbd1f-690d-440f-854c-e8a7d8d2c4f7.json and https://artists.proofprofile.net/proofs/artist/908cbd1f-690d-440f-854c-e8a7d8d2c4f7.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 0x9fd08d1519705b38d4d8abc2e003af36e416efdc8c5d97495bcca22ef6c34e6c. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZCE61863880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f48cca83396ebe91ea5a78ac014717741e3e93c64cbab4121f4b294bf6b3a2b. 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/QZBRF1842810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb40b41e71cbc0470125f82c801b1be7e9e24ee8f562c0e720a99eed9adce8a60. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZB4J1866982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6dee54ae0c8024e202c05c4348b6a9689e78526cc6e221700d996c25bb6782. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZDA71932786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c1060ff4826832e556071844923bfc1bcbf30f4f419c33f31584f0987023db. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/USA2P2012931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbffa3969fe482d62402aa3efaf8e2ea1a6831dedbf57c496934a15dff31c44d1. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/USA2P2018799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde042c8d02d9be08627aa7984dcdf5096afbef0d6edaba42c2956b222469463f. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/USA2P2117401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f4b4bec63fa8f6bfc4ef00d1451048515282291842076f96c59e90e7995098a. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZ93L2132561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fe34ab0b2c507316f2f550afbd003a7a201815c7481bb389b070387a0aa7760. 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/QZES82243854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539ccfd4194da1b8051ceef8d919fc7dbd0c36d8fe25b2a3d6207706343782fe. 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/QZES92358680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2caa3b5088fe6e3766613127b97b51be1f495b2853e1b28d3f8425035b27f2c. 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/QZES92358682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a2dc823a2cb38e1f7d9d7386d9467bf735add84c8d99d4a4e2d8a1dc428162. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/QZFZ32529031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6405fb4847cdf641fa44831846dc461867142bea9165174617c80c90634e2752. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZK6Q2572811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a2dc823a2cb38e1f7d9d7386d9467bf735add84c8d99d4a4e2d8a1dc428162. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZFZ32529031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf726c951625f49b819a5c32dbd06c55052097cd3f97ce1c7d6b8e6ae65ab4a8. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZRP52557907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d515a2d41d893a7de7ba3b6619f64418897b4a9bf54ea0d17ed0c0592a54a59. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZRP52557908.