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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62db673f86c15cba232c16609a1c3c20acb8fae6ce067c82585c7740751f4d80. 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/0bb437ed-0d14-413c-8ae4-daffcb1c668c.json and https://artists.proofprofile.net/proofs/artist/0bb437ed-0d14-413c-8ae4-daffcb1c668c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mozart: Serenade for 13 Wind Instruments/Serenade K.375 etc
Serenade in B flat, K.361 "Gran partita": 1a. Largo
Academy of St. Martin in the Fields Wind Ensemble
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd423d03d5f96550c34dbf328b4c2c8f1e929f637dd7da667b8c9f7907e1089cb. 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/NLA508319301.
Serenade in B flat, K.361 "Gran partita": 2. Menuetto (Allegretto) - Trio I&II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa27ab9bf1ff59c67f44362feda94170211e0c7b97b8848c32119d236210ff60e. 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/NLA508319303.
Serenade in B flat, K.361 "Gran partita": 3. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe01c34e09a9e8ce39c4c286a534e865e37e62e25192579cb764fddef78a7cc. 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/NLA508319304.
Serenade in B flat, K.361 "Gran partita": 4. Menuetto (Allegretto) - Trio I-II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7919fe202f8072f91a4a2dd468dd87f4ecbabc5d6f211db34b28150db32eb2b2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLA508319305.
Serenade in B flat, K.361 "Gran partita": 7. Finale (Molto allegro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc158958576cb24b6d92c6dc82ea83765b0b5a7777904784cad6635c64cf27ce. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/NLA508319308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07322508cc04582642bb4f1b0c534300ade67623cd9d0956f7f167d998d0b98. 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/NLA508540308.
Serenade in E flat, K.375: 5. Finale (Allegro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c066d6a313a1a4e31ad9878f17ac200db01230e318b2de73f68febd1f244aa. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLA508540309.
Serenade in C minor, K.388 "Nacht Musik": 2. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd668d20c2d6b2a97b90344033bd47bf9cf819703189a251ca48ec243204740e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLA508540302.