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 0xc5c8712827fc9e6ed6d9ebb8e5345c264c45126b69dba76720811aa3d7fd59cf. 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/4e954ecc-2b5c-412d-9132-2b4ae85c4ab6.json and https://artists.proofprofile.net/proofs/artist/4e954ecc-2b5c-412d-9132-2b4ae85c4ab6.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 0x94437d9128478b9d72514e64e06f7640137daa869d4da0e62d2d66525a9827c7. 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/HKD250613011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa752acb088ba215f9d27fdad1f714cd7e9f77105495349068fb9a3a0589990. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/HKC630702291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7e431c8845b3b1916d7a5766026b5c2a59538781feb0f98ccb04011bb58570. 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/HKC630702294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf786db426138ce7dec3f079882f801480ec81727fd378d18f6500706dae9a316. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKJ309100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da5061fea5c07568630cc06f0f07563228f7e4a8c3a6aaf31a47ec2137d7ae9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKH580370101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a34c1a55d779d576809e51f5873500a3c03715a0627a164faa3606888f16a6. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/HKC630702245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc27dcf20639a32e32dcf4636acef3132a7360db7eaa3b163603d8caed6a3b976. 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/HKC630702297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe411fa837cf2574c8c0ca0280c3e5233087871354fa9703176ece6632858cdb3. 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/HKC631003555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2bdca818a5593ea5f6d1a4da7c005e91a8d945e070a30faa2041cf8ce736db. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/HKC630702163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58bfaf8b0de1ab9768e84853fca04e9d4af915c5b2ba691b3de222d3f0113ae. 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/HKC630702292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda9f9e1d2b8011726d9cf892ef2cda61deb27dfeb75ce42e160b562b8d68bed1. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/HKC630702278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa752acb088ba215f9d27fdad1f714cd7e9f77105495349068fb9a3a0589990. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/HKC630702291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94437d9128478b9d72514e64e06f7640137daa869d4da0e62d2d66525a9827c7. 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/HKD250613011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16e9fa7f90bbce4dbe8bf421a4cbe2c22cef483493d343fdd5af0a6d3e92cc5e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TWAW19100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6929a1b9316be9dd2b9c6da0c33b16031e1935e20d818132f475e25bf058cf68. 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/HKUM71000716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08510e0c4c3febfbe53f710eb0a6737cd82a0b04c53c8b14c7a46c3f597210ad. 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/HKUM70900514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da5061fea5c07568630cc06f0f07563228f7e4a8c3a6aaf31a47ec2137d7ae9. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/HKH580370101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd327179b4b4bc67a687f991ee2ff53e2330afb0c2e45e7a21288020fb922e5fb. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/HKG579290302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a66047b0916efd5ea96833d79cd29c9db7dc438881b9cd62c24ace68df1484e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/HKUM70900506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a66047b0916efd5ea96833d79cd29c9db7dc438881b9cd62c24ace68df1484e. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/HKUM70900506.