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 0x4ab442e858dbff9c2ce45bd1d90239287a110976f86062f48863a5edbace79d6. 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/4af7be1e-8fe1-4252-ba06-0a41bc351a8b.json and https://artists.proofprofile.net/proofs/artist/4af7be1e-8fe1-4252-ba06-0a41bc351a8b.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 0xbc548b0738cadc75949a42b31ed67baaf413fe363327d7c0f129873070f41026. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QZ5FN1922726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e53d6d54c4873f3c06d4dabc24a3da65ac6fc0397b6afdd7f10d43f8381bbc. 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/QZ5FN1922730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316450d1cabdb063a261066ef61b73d069e38a387fe64824c5cbf5609bf69533. 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/QZ5FN1922758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a6862e643c38c96c1dfb95cfaf3a3424b628af708fc34b235c23ef5db20371a. 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/QZ5FN1922763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6078bc84c208dad7f29056461b5009f48136f6ad50ae95c30733f8f01caa6577. 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/QZ5FN1922776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8431360abbe7bdeeba23a0ad0e7d85dae5d98f7652c88ca68bfe0e984c80ccb4. 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/QZ5FN2014996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6485573d0e772bd33d2b56769b0c6dd79c3767ee399b494b833642116a6fe644. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZ5FN2014997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f182a50cdd3fb38757c098b73d8df5631d629a7ce5e0d1238c7227309989b8. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZ5FN2015004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb83ef56c7b611baddc8a7571a2045d1ed635df7f0cff65eab74f18589ae7a9ba. 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/QZ5FN2015006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9004a0a152e6e2be21bc7da8f6484ecc7852c9f38b0e17e453175f842d75881d. 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/QZ5FN2015012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7031475d42788aa99d43589362ef0e6ef3f00c7efe6b4786a845aa5935542f24. 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/QZ5FN2108423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f569a6b1ac2fa7ef67bd4df396989d045a97dae7bc7a5afcb957a1441ba011. 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/QZ5FN2108425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e956453cac5859a0ca6a12d10c11e564b78a82145014c9958405bc268ed4417. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZ5FN2108427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fdbf483c097eb32b3ac77c1e38f69de97731b6ec09afd8dd068cbc4b0dc8702. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZ5FN2108439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f980dfa080c073db608b79146b0136b9d8a61f271ac1e8bd7c9245ab5bb5e30. Chain 2 (Bitcoin): anchored in block 956775 (2026-07-05T10:41:06Z), 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/QZ5FN2108440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2205847fe136778b20b2d8eb8ad0b8bae079586f6710280ef945ce4e2491981c. 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/GBRKQ2560538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85bfe1ed74fb22d33d5e79e5aab757a9f01f29a56cd341afc57f1ebceb3e88d2. 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/QZWDD2581627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88985e33b0579f8c44c19deaebaea28516ea8b93101b01a774c9312d76b8f02. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZWDD2581650.