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 0x8abb97f576565443d771b50c2298af068429cd09bd0d2c0a716247d237204fce. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f3b7603f-f0e0-402c-8ba9-7fec4e75395e.json and https://artists.proofprofile.net/proofs/artist/f3b7603f-f0e0-402c-8ba9-7fec4e75395e.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Benedetto Marcello: Sinfonias & Cantatas
Sinfonia a quattro No. 1 in B-Flat Major, SF C781: I. Largo
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 0x4a691aa77fbffd82f5bb9e4ea40691aea25b6a4d732b1d0e883382d59c2fc793. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DEE472300251 — a six-check JSON result.
Sinfonia a quattro No. 1 in B-Flat Major, SF C781: II. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc03fed7386ff318966665b6ace4564cd237b452878e83220f66d720334e53547. 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/DEE472300252 — a six-check JSON result.
Sinfonia a quattro No. 1 in B-Flat Major, SF C781: III. Gavotta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ddc75120c123dbc8276e8061a41599e2cb839dc281cd7e28a4de60502344943. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DEE472300253 — a six-check JSON result.
A voi prati felici, SelM A4: I. A voi prati felici (Recitativo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd35e5d72dd6b632aced6073c2cf8fa65913fc853fc0e18f26993caa451a57f. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DEE472300255 — a six-check JSON result.
A voi prati felici, SelM A4: II. Voi fiori che siete (Aria)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5887fc74f42f98b04914abdaa519e4e5a04dd52b930b72a626864420d2e0edf9. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE472300256 — a six-check JSON result.
A voi prati felici, SelM A4: III. Fiori sentite, il so (Recitativo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x731d9c89ab9537792dd6783d69ce46804440da0a03692d7fc09fe908c92849ec. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE472300257 — a six-check JSON result.
A voi prati felici, SelM A4: IV. Perchè non dirmi, o fior (Aria)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8be8ea7b056912c498d48630ba7c12109be1bf6affc3a37ae5333e21f32566b. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE472300258 — a six-check JSON result.
Sinfonia a quattro No. 5 in D Major, SF C776: I. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d26dcb07c5985ce4eedaa41db0341939364f0900018dd8c0fca1c4bc54876f5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE472300260 — a six-check JSON result.
Sinfonia a quattro No. 5 in D Major, SF C776: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea75df9b6fc0edd6893d4e4ee148cb23beff012cd6d074ea5b4e1fa5d6664e38. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/DEE472300261 — a six-check JSON result.
Sinfonia a quattro No. 5 in D Major, SF C776: III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3153b8871a30644e06a65c0dc0efe985380e7703bf1064027c00d80ab9ef987f. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/DEE472300262 — a six-check JSON result.
Qual turbine improvviso, SF A266: I. Qual turbine improvviso (Recitativo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa41c0b19044cb9ca578dc08ead61077e411df1bcdf8e581e9d56e8f8ea536344. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/DEE472300264 — a six-check JSON result.
Qual turbine improvviso, SF A266: II. Al turbine che freme (Aria)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901cfb96d6976aab1e502b05d0c1b5293013cfe91c21abd82608e76a61dc1928. 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/DEE472300265 — a six-check JSON result.
Qual turbine improvviso, SF A266: IV. Men fiera procella (Aria)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f1e04aee3845dae171880220b3a19698f799c8e7248ed467f6851406135c06. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE472300267 — a six-check JSON result.
Sinfonia a quattro No. 2 in A Major, SF C777: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a29f061f9cca06c0a04f3be88ab6014d835a9ca3ffb0d76342665eb2197055. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE472300270 — a six-check JSON result.
Ti sento, Amor, ti sento, SelM A350a: I. Ti sento, Amor, ti sento (Aria)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fcc963f276070c38d4232c5dde3d1fc0f829323212cf6006c94c05a4207a061. 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/DEE472300273 — a six-check JSON result.
Ti sento, Amor, ti sento, SelM A350a: III. Pur che tu m'ami (Aria)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe550a3187efcf6ca995a2fbecabe28a0708d14dab14e2574f6e11935709e1c61. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DEE472300275 — a six-check JSON result.
Pier Giuseppe Sandoni: Cantatas & Instrumental Works
Partimenti Napoletani. Music for Keyboard Instruments by Paisiello, Durante & Dol
Der Soli, das Deo und die Gloria: Eine Geschichte um Johann Sebastian Bach
Organ Music from Multiethnic Transylvania