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 0x84b6e40f844c37ae32e9e23adf509d6e5a814f7a79e9b8ac8f77eea83041c699. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8ba1e4e6-1e13-4b14-b685-95f7b97d8c65.json and https://artists.proofprofile.net/proofs/artist/8ba1e4e6-1e13-4b14-b685-95f7b97d8c65.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
La Passione di Cristo secondo San Marco, La Cena del Signore: Preludio orchestrale
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 0xd188cdc4d1bca262bacf387204c89a0fe6a4ee2f21cadb936655a9baafe80b33. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/ITDF61500030.
La Passione di Cristo secondo San Marco, La Cena del Signore: "Vespere autem facto" (Cristo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dc6139f563329473d674f89a0da251994858ae4677e5212c43a2c102b9d5469. 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/ITDF61500037.
La Passione di Cristo secondo San Marco, La Cena del Signore: "Unus ex duodecim" (Cristo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb72d9a12dafd96c9c8d03555d15fe83e5491d4231c4e73f78688a95c7ca41355. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ITDF61500038.
La Passione di Cristo secondo San Marco, La Cena del Signore: "Et manducantibus" (Cristo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x864ba2ebfd2ad82e21fea97acff3e7b307136edd1d43bc24a0c68096444aedcd. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/ITDF61500039.
La Passione di Cristo secondo San Marco, La Cena del Signore: Et hymno dicto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21f86c49d3f872cd92559d9a7a97909e9a59a992bf5f34624110f066b43b6885. 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/ITDF61500024.
La Passione di Cristo secondo San Marco, L'orazione al monte: "Et cum processisset" (Cristo, Storico)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33fd42b4b558624146a7b1c779a5bf9cc7a512854ee985b1680073183e53f0f8. 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/ITDF61500027.
La Passione di Cristo secondo San Marco, L'orazione al monte: "Et iterum, Et reversus" (Storico, Cristo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa44fc878bfb66f0f24a02b4f042ac469e9246972c86d1fd9c7dd326254980fde. 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/ITDF61500029.
La Passione di Cristo secondo San Marco, L'orazione al monte: "Et, adhuc eo loquente"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x069edb01e2ab4e253660eaffc0e1fc29e95f048aa80fdaac6912596bcd720c90. 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/ITDF61500031.