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 0x6aedf3a6ad04d5985fbf5cc816103676a983cb84793ded0401d64240ddeefa59. 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/870d0a90-2764-41e9-83c9-09d8efcaf331.json and https://artists.proofprofile.net/proofs/artist/870d0a90-2764-41e9-83c9-09d8efcaf331.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 0x88d770464e0a978fda781961aca633a3325548f9e39d3daf5c44169af314eaf8. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/TWU711601022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e6d018fac1e44ea29fada7b74fb838f37534f6a5e7423d3b361dbbdde72ddf. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TWU711601035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ffe3db05d7831e276e8e42b13d3b28b05c7b83bf209cb9994eeaba42cfe26fe. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TWU711902379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x059e400f1f5fe5003a085b7a7184ceaf2342ed2c97b3fdc5f6c7b065c91b07c9. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:27:12Z), 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/TWA750800301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb126761a96f1bb4d6e60061adc360203f2b3083cb822e4e285d549e72aea17. 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/TWL251305201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf2be404a2681f1441c7bb3e5c7d41895167e246d3db05fe708805ae7d65d5ea. 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/TW2151740001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd09039e5a3949ec30f8477d1145e5c8c3c62e8dc8be80503affab77d124032a5. 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/TW2151740015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0953140a0ad2f98fe3d4bd85813515684427f8174f58112a88f28e7b100cf38. 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/TWCC31900591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x386e8abf7819f090564c887c8408518cc663e9ee0d764891f8855d6f67067115. 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/TWA452314302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x534339136d3e36fad8e2700287adc9499662c2e964e85da4721a9ef068709d52. 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/TWHB12107001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd081e55c90309e818e25fe7f1bbca2ff94f504dcd87e97e9ec8c699614a988. 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/TWA532121104.