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 0xe626b0857f15eaec47295da014440f7dafc417e36f3adcfa2343a4dc4dc512b5. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/19f4d6e7-035c-45ac-a328-c9972b94533a.json and https://artists.proofprofile.net/proofs/artist/19f4d6e7-035c-45ac-a328-c9972b94533a.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 0x7e3a08f0afacd2e5e3c4c256cf22602149713d1486252c39dfea07ac4352cdcb. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZFZ32315295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07bc31272d1d72e0bf996166676745a41ddad2c5c12e528685f4c2f4d324a151. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZHN62313449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96cd1c34c01f14c79d19acaccd1eb3befa60b88f9ac38d806184a2f404e36bdb. 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/QZHN62313450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5130bd96d8878625277b9125a9b2f33384c2dcbcc42ff33697879f72e51df8f2. 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/QZHN62313451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e12f1c4c704ecea7f54a008f5d5f53040318efeedb6dd27e4365c45b9c19d23. 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/QM24S2203592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a5a8a4b56d890aff1d54db2e945e71bd06c45ecc5ded72d47a3f83451f341cb. 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/QZTAT2141450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9bdd853fee36a5985a75e6a728e7c873d412862ffb4c40bcef08576ade2919e. 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/QM24S2203590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc25642654be7074695327291904d2b29e5bdd0e8d13d05f248b0926e28e47143. 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/QZHN32223143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3306179e51292470eb89e66c9f225011f2e5530fd97c7091be12e2aee371f9c. 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/QM24S2202813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd4e8ee9426011d7137b70dcb772ece1b6df4ff9952455a230c8c0c6d98d9098. 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/QM24S2203589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x075f9cda5075adbd1c4ae2653ed7cce41afedcf3e2e315a181d771a10ecab173. 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/QZVEM2398991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8c496fdcdd568c1753796a9ae8eac4ea4ef5db858d04fde49e3f26f528cdb48. 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/QZVEM2381903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d6ecc42a15421a1afc0b39a320482b62e662313a506b57c3f138f39925c66c. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/TLREW2222090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3306179e51292470eb89e66c9f225011f2e5530fd97c7091be12e2aee371f9c. 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/QM24S2202813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a5a8a4b56d890aff1d54db2e945e71bd06c45ecc5ded72d47a3f83451f341cb. 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/QZTAT2141450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6080f4700964a5f516024fc0cd239af80d86dc8239766209540151f7a0cf91b9. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZNWZ2472445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2465be980ac94bf0cc65e94a47a353dae1fcad7777457adf13812da256bd21f8. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/QZ93L2057317.