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 0x70609bc58bb9e2d4926f54422ecab97169fa3850998b1f2e11055bca615f8b8c. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/23f2d3e8-d2db-40dc-949d-96adc600a31d.json and https://artists.proofprofile.net/proofs/artist/23f2d3e8-d2db-40dc-949d-96adc600a31d.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 0x26d10d8b7096b0f94f07cd6e7c9ff275fa05c4572f81debda2a1f3209f041d31. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/ES71G1923656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90203dbb81e7afedb09871c123ac1490006c2bb0fa74942d8b42e79640691b0a. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ES71G1923657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29bff6b094f19e8af68fd6ae060e2830a53076bc7559c22ed425bb39bced2b29. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/ES71G1923658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef2989de0fd970c4cea5c9e17c7df3b9909959ad4ca9830dbb777e1fa71df30. 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/ES71G1923659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9512eb6a4d65925aaef5d48c76ffe4254a3af9c6205c2cf3d51e8a275151c12. 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/ES71G1923660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc471a21350d4ddfd895f2f52f8dd63feb11afa6f077a8f1aa4dcf242a4e5a804. 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/ES71G1923661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01a6d54213192b710009da959fbbfbbc49666f6d3c7a2be16a31bcbe9de3edf4. 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/ES71G1923662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004a32efe83ed19d012488f9c097fa899058d9dc346bdb7051c130931179e4c9. 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/ES71G1923663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb86c158492ed907e86832106dfc8dc7bc38f85a81b2868e31ec46b3493cbce1b. 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/ES71G1923667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf47e5f426d3f85a133bd9af1539f08729e0dea4ebae516a225d92226a92dc300. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ES71G1923668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b9a94b3298832eebeb8e3993b3336e8ba9dceca6de2e50667a4a1b6d711c766. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/ES71G1923669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76b0fcce22711f0fce47c3b7f059fe15a6d4a8eb724fbd96f67e09fac6bcd24. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/ES71G1923670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e869a41794475c11179cf180ba41f3c0f3614e4b444b353c1fa2fe8c1d8964f. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/ES71G1923671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68fb4a6abcf0d1fd6da1a9493f082dd763fbed5b6456e0b65582b17190fac89. 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/ES71G1923672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf538f91560748e6970ecb680b8775e066138c7c4e192467a9d760e19348ecced. 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/ES71G1923673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa9035c7f7b02ebdc659d9e6f85167a0a0a8cce5281baac4a30e891637d50825. 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/ES71G1923827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e6a76a1c895f26cc6f5c4e4026b2af520219ff0b56378d20e4021c99852c595. 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/ES71G1836372.