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 0x816af52cc4f4da2ae04e76a6516744f0c636fe3e23f21f6e5288264c0963a106. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/14afb022-2b6c-4042-a64a-6dd3e63d7b36.json and https://artists.proofprofile.net/proofs/artist/14afb022-2b6c-4042-a64a-6dd3e63d7b36.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Marie Marie / The Sound of Horns and Motors
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 0xf8ff1abd525c96fd96976efe6e1c8529f83452986d0d928e15865743cf228a89. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/DEM402400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8a14bdbcb3f144bb80fdf933d64fb18055364582a36ee79553fe2ea3968371a. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEM402400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e26b0fb4befcaa182e53c6124998a36effffb8a5e7fde3aea40d868e367681a. 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/DEM402400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f70430c836e4a99c180d6b1b1ca55601d20d0ad43e97c11059f51a9e450549. 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/DEM402400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd4ef31ba5af323313b7dbed60999003fee3eb3025a5a93a5393796dea9ce231. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/DEM402400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f25a3981d69d401d28bd01fd303d2ec6c71a343f26201b5ea42227af67045f. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/DEM402400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab5661edef4cf87b1621565d499359cc6dad50396db5e512f1ac557c3a20ad74. 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/DEM402400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87baaaa70e3c5b0f69c671d7eee89765874eeed626c2e3cdedbf9ed133f2b629. 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/DEM402400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a2b3825c14088e0a631746c6b5c7c323f5073c33bbeeb44568622b650ba326a. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEM402400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x950ccb9ca28b5f258b6bbd422463d7dfe09664298bde0fdcd54970c88f091d6b. 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/DEM402400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1968f5f741ca36a2b97f51d3fd939fd628eb9ab4df113ee9270b1fc9068b3d40. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEM402400014.