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 0xa0194187a121d6580716eaebe06d7314fef8f302ddc935f7506c04153f4b21be. 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/7d3dfa12-400f-41aa-9611-bb05a645b359.json and https://artists.proofprofile.net/proofs/artist/7d3dfa12-400f-41aa-9611-bb05a645b359.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 0x107f17acc247915182712d3d3644693a55705cba32ff34542021eaeb37ccf9ca. 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/NLRD52017761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77e38727d8c7852bc47581d9841cde1ea03ac3e3cbf0805182cdb8f86044b84. 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/NLRD52017732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803c6b507c9ffe91a798f28d308b061aa6770602836f8e1f79974f2a11aeef4f. 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/NLRD52017764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d8ff3813c1bc78ff7b1de78d50de675f95616e28a94b17d0f66e566ffb46bdf. 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/NLRD52017765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd66813289c3de73eed572b74588703e45809d1d3160675abf8630f86a46590f. 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/NLRD52017766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedcb00fbb6b5f686ecf365c6604ce6a96bce97f6650617a00db62f3d81b50224. 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/NLRD51966009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a33a8b2e941ae1caba1cd7a6eb74efcca27b6e7c47462368b9ddd55326484b. 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/NLRD51966011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b18225379e26c75b5cdd2124142914a9e1beee8cf2b51e9ec9193bbc833322. 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/NLRD51966015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77e38727d8c7852bc47581d9841cde1ea03ac3e3cbf0805182cdb8f86044b84. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/NLRD52017732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3cf7ba8725a64c65c2a22f180cf161e4247d59efe5c58a776a0f211e27e388. 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/NLRD52302295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c77fc2d6ff04a94dc1d5b03a788f02977fbbf91d18b14a6cf5a82a42af403c. 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/NLRD52302209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eea7d366716c8337e49049013ea7431aa070dbdc9090817968aadd2dabb9852. 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/NLRD52119837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb22088af460d7b4630cf82103fe124809ae3e9ae2e67ea9968a44d09be161e. 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/NLRD52024042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc1c9b2eb2c18846a78f5e8b038c6e28a839932d750b23124e123fdd6abfa296. 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/NLRD52024040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7faf3dbd2a7288b3f305a8096a4938841186a39b4bb227b3262db3f4190860c0. 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/NLRD52023902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a73faedf9f519f02f2768983e79939f1d3994ddad8b5fec93909be21218f3ba. 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/NLRD52023901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf2fe3d2adcfe78b3189d11206238f30339dbacd6c0a85a6b54e815431de3ed. 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/NLRD52021932.