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 0x0a2d4bb4e042517d85448381c4e316d45418f36f0f91c3e5671a66c93be8b2ba. 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/5ad7e8f8-6a51-4221-8742-9ea4a6675b83.json and https://artists.proofprofile.net/proofs/artist/5ad7e8f8-6a51-4221-8742-9ea4a6675b83.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 0x683545d2c87e143b50b70fea745ead3a5bb270dc58e20bd9a21ffbc4cc3ca21a. 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/QZ5AB2004464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6501e3a788fe5193dbbf490fc11de15d59bc9968f16b81a15780c0af47ea2b8b. 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/BC6M22300054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b72dc48ab5c55f19bb36dc72f3d1b3988cf7ddeeee1a4713ae42799e04e2c82. 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/PTVI11900161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x989cee4a0de3275a73b15a79bb0a626121faffc892ec1df7d91fb1a201ea4935. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/TCAFN2104981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa326a8eecc78c64749f4a8e966abbc128133b9963d0187a228d83813f24e3032. 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/BX9L12100073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb7464e0166d06964cf07a853e3008448bec075408c2f34b7b8b3225dd0720bb. 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/BCDMP2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c45e932af81c7780acace0d042a3291dbd2cbe24a772de390b3db3c754061f8. 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/QZNJX2447089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30c0578e7e965c237b30d52f2bbde490c95c0ad163951faeb901b8816a89b4bd. 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/QZMZ92221291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13215a5837777e073ddc58d4707920110c46d37ba8cd922e2ba05d64c409a7e9. 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/BCHFD2200184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e31746b904cc6ad7884f6844504c5ae72532a339a3fd1377c59532553cf8a6. 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/BX9L12100085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc964d92aaef30efa07368b1fd545634134fe77a481e64f8e558cefc0ebe5c94f. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZ5AB2098670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84020498553e071da105bfe4f9c8982a53719171eb2d7886f819de045c688480. 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/QZNJY2461639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a121b44adad4cbae203c1c81da957aa949169ad48319e53ac05e9dcdd44350. 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/BRSVB2400203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301482a2ebcc324cae58c0fefb1a4d49ef9d9806eb54d8cf4d59848d0732c24f. 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/BRSVB2400204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a47af241cef5481520b8c29aa8f9cb7dff343c4a11afdf4ba7de10299b2e70. 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/BRSVB2400205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x493ba3e61961d0d83198067b0aec484290bc9caf5c4bf0d57c313bb824606828. 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/QZTV32359249.