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 0x95d2f151fcd9236bda71b4e25bf2fda4d36bb1f623cee288ccb3e3d9c619b1af. 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/24e13991-892c-401d-8184-aceb16d6761d.json and https://artists.proofprofile.net/proofs/artist/24e13991-892c-401d-8184-aceb16d6761d.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 0x2d8ad710921f2d8c68b33406189c04deba47fc02bec520cab76a3886e8cd938c. 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/USHM91774198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97cb46cc886febfa14fb578757b90f36800839567bb2ad62138b0c674c9922e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAEF1989999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3abbb0e436027d5486cef7c456bad7d4a8d2e6654e20cdfc0d1cf8151feff1e. 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/USHM21850888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48bf5b447a20806ee07140bbbe045f4bc16eb3d3e8b60ad01bf9bcc4f024477e. 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/QZFZ32025546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x478a6fa109ef30a907bc46e624a4a7321319163de9f50d431e13d30ad7395098. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USLZJ2166417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e2b58b2efb63d17e5e24f87b6010bc47acf63a99cf11473c92082967ed56a08. 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/USLZJ2166459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd652dc6f8ad469a606218ad5a253e5f2c8a84f4f3d993ba8bad21d4f1959692c. 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/USLZJ2102141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0f424137de61642df3c7536798e041cb2fcc20d62ab94e2643c0249616e40d. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/USLZJ2166489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x058e8073d43b3df3b322cc7a44ab1287bcb474e14536c3d52376c7eb8f01aef3. 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/USLZJ2166517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9218f3bc0fa4043f7a3f38aa8338889f3e0e3733ef593b9f19ee1157cf91a80. 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/USLZJ2166658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dad6bc4a4450271c15185378640a8bc732df4ab74532e27b7fc8c369a1691a4. 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/USLZJ2166672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ae1111ed7cbbf5ffb98949d6a9bcfb26d009773dec2b587871bbe8b3f41837. 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/USLZJ2166685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727ee448c595962736461d32eb09a0bbd4e060ad3a79a066600d1765f85b9db9. 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/QZDA62080307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd46fb1b3c008d9e571948902de5480b1f70b3a010c3cb78e1935cd8685250e25. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZFZ32016359.