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 0x32953e0ce65d00ef50f78bbd52d43283be47632a748a608995d30c6fc307a79b. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/230b10de-472d-4d19-8438-4c31521d9478.json and https://artists.proofprofile.net/proofs/artist/230b10de-472d-4d19-8438-4c31521d9478.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 0x90707c8f72b066f8080dd36c5266c6b206c33783af419255aa38212073921906. 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/QZMEQ2417610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9be6d179becfa7bab9945242e1e971f4a774abd0d85dc0b39d486f03cb922f74. 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/QZHN62403517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x236e20132ca570cc6a8c284284400b3d7cd22e1c9934bec196ddd50baf163ec1. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZHN62401134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f4feca75abcc1f900107b1452f683efbd4eeb4ad93ade3f7cedf95e38be134. 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/QZFZ22446196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x196f93cc504e26f367d0d2cbc47e4b76ec167f75b00942ea1ad8512831bfd70d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZNWU2388497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6240d84829d0aee7684ee04abb34d6b9d1e52d93d48dc5361ed5eaaa22d451ca. 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/QZHNC2393121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa68f0ffb955fe42085ddfa301ab4a43fc70295245599c07b4337f46385385aa. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFZ72338778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2e7e58236b7cedb0d424bc3662dffb391d6ff18e505dda7f95c6f30e15ad25. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTB52203152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2e7e58236b7cedb0d424bc3662dffb391d6ff18e505dda7f95c6f30e15ad25. 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/QZTB52203152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1015842e7ce3cda31d58668cfdb838d8cbf92e946ae0911c4774a0a0d1793198. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FRX872155575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb297712dd4185244ff1755757845710a290461ca2d73e5900ca4650189fb5176. 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/FRX762166158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bfc2931d62a6549dc066e05f0b67a044c85c6f0e0f7a6a68414cb6bb5789d4b. 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/QZK6H2144112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85056a8a8358714ffa62584efd09c050e131af31761e663daff0e5497db60637. 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/QZFZ52105234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c738855c6cee11b56178f453551278d1045c98e0d685f97765d32d2531657f8. 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/QZNWW2032895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e027cf40e7f7baf8b31ce5da361b40a7af5b61458a386873991f3f3d56412e. 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/QZK6N2009258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d49030cc3399192449af1773ac46129c4d26b6035b46e18ad0089e1cbbbc0c7. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/QZES92085909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323ae141c04fd7af4ef42170bff935bd0af1452e975b60e534eb935e5852bf1e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFZ42016813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b2a70a2f44afccc8e0994bf9be9e9a9e63725ada4d79790b34cdec488c668f5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFZ42016814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x093decc4804f38e8e8f9f869b5ea8379dd059413fc953bd75bc9f7182ee24cef. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZFZ42016815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f98190c4f0243c25193e9a72580758f125a3d07df147247de35b1b9fbe49ea. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFYW2072283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcc0f0449c4939062926c6864dd9408471276422a7572520f593cba11b9ea092. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZFZ42016816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f98190c4f0243c25193e9a72580758f125a3d07df147247de35b1b9fbe49ea. 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/QZFYW2072283.