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 0x62db673f86c15cba232c16609a1c3c20acb8fae6ce067c82585c7740751f4d80. Chain 2 (Bitcoin): anchored in block 953885 (2026-06-16T04:12:47Z). 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, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 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 0xd423d03d5f96550c34dbf328b4c2c8f1e929f637dd7da667b8c9f7907e1089cb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508319301 — a six-check JSON result.
Serenade in B flat, K.361 "Gran partita": 1b. Molto allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef54b3273ed3d92f08c681f047651db801d5bfdbd4cb694d3d378245ab30ca21. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508319302 — a six-check JSON result.
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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508319303 — a six-check JSON result.
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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508319304 — a six-check JSON result.
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 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508319305 — a six-check JSON result.
Serenade in B flat, K.361 "Gran partita": 5. Romanze (Adagio - Allegretto - Adagio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d0c9c5a00a6a66b4047827f846a19e8aab45c396aabcda9d7e3bc23c17e168. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508319306 — a six-check JSON result.
Serenade in B flat, K.361 "Gran partita": 6. Thema con 6 variazioni (Andante)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x480145f3cbc6f09860c022149ea654cabc9a4b223ca770db965706972991e89b. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508319307 — a six-check JSON result.
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 957050 (2026-07-07T14:41:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508319308 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99aaa4f3b2019cef61c4e1355bca82f3879bfa8135c48cd1811eb2ee6e309ee3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508807012 — a six-check JSON result.
Serenade in E flat, K.375: 1. Allegro maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3372c24a46bcb0ec11fb99e0bdcfc50e725ef055fe20d3459f8cbb0077add0. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508540305 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc60666d4d540a82b2ca438cca28c9b88e9d0898a55c964111adb3ddf3a66d07c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508540306 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51f3743a9825dfe9f53ff8a5d670dc756324bc36c96c52587f31440adcf7bd3. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508540307 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07322508cc04582642bb4f1b0c534300ade67623cd9d0956f7f167d998d0b98. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508540308 — a six-check JSON result.
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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508540309 — a six-check JSON result.
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 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508540302 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3372c24a46bcb0ec11fb99e0bdcfc50e725ef055fe20d3459f8cbb0077add0. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508540305 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51f3743a9825dfe9f53ff8a5d670dc756324bc36c96c52587f31440adcf7bd3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508540307 — a six-check JSON result.
Divertimento in B flat, K.186: 2. Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbac6531e88d2a260b0974c98597966febeee3ce7f54675e00cf28c080a99bbad. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508807002 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99aaa4f3b2019cef61c4e1355bca82f3879bfa8135c48cd1811eb2ee6e309ee3. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508807012 — a six-check JSON result.