thumb|Gervasio placed an advertisement in The Public Advertiser, London on 27 April 1770 for a concert at Exeter Exchange. Giovanni Battista Gervasio (c. 1725 - c. 1785) was an Italian musician and c
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 0x9cac35bd1aa2ebfb5bff29b0a898eb708b2708e201eed18650976e38a79c4605. Chain 2 (Bitcoin): anchored in block 954500 (2026-06-20T04:47:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9c4a0973-bb0f-4641-b6e5-cc28d5222de1.json and https://artists.proofprofile.net/proofs/artist/9c4a0973-bb0f-4641-b6e5-cc28d5222de1.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Un Air d’Italie. The Mandolin in Paris in the 18th Century
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 0x2d9fe81ca399a9e6e26eff3836aabc2d70255b8f80ba929e24f3d8944abb61fd. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/FR46Y2255223 — a six-check JSON result.
Gervasio: 6 Duets for 2 Mandolins, Op. 5
Sinfonia per la mandala in D Minor: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8df686e65257df9278671203622045236657a90136379ccab094eb993a0b0f. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QM4TW1570404 — a six-check JSON result.
Sinfonia per la mandala in D Minor: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510cf7e4ec5472aa32f8f4ac7f3e532194770055e629514e4c8983ddd9499703. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QM4TW1570405 — a six-check JSON result.
Sinfonia per la mandala in D Minor: III. Giga
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c177ed465436b61e7fbc85549251349d1da166e41961e04678a74930c83ee6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM4TW1570406 — a six-check JSON result.
Sinfonia per la mandala in D Minor: IV. Minuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b7ebf4ec5b3199ba9e6b4bd016238a6c170462c75a29bcc2e15de409b9be5c. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QM4TW1570407 — a six-check JSON result.
Sinfonia per la mandala in D Minor: V. Giga
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63acbcd0b80ddcb55b2e6d3761b77b29fdc5ff7b5fa4c245eee4dbd2521b1a93. 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/QM4TW1570408 — a six-check JSON result.
Sonata per l’armandolino in G Major: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7004e61aef17b57005e6d19893db3b0f0944f2b65c9999aefce3685a5d189c. 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/QM4TW1570410 — a six-check JSON result.
Sonata per l’armandolino in G Major: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x067074e842105ca6b47ac462a74ad7d12a9a0cb944faf83b4d55736711d62186. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QM4TW1570411 — a six-check JSON result.
Sonata per l’armandolino in G Major: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d7cbff352953b0f06f6e5fe72cb1d8a61ca07e86dad44ad43d759c693896f9. 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/QM4TW1570412 — a six-check JSON result.
Sonata per mandolino in E Minor: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f37902ab39e7f582bcd55ed86081d5afae1f1e216599ee5ac04d535751b973. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QM4TW1570416 — a six-check JSON result.
Sonata per mandolino in E Minor: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd23d797d87a0ef2e236660795bf5d48ef70fb0f19c5bcaafccd72413e5f9bc57. 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/QM4TW1570417 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b59a1339042a763a9ea59c3e43d88591745eca540db009ece925ddb3c50f423. 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/QM4TW1570419 — a six-check JSON result.
Sonata in G Minor, K 88: II. Andante moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0391542d87b8f9991af833e7a9ecc0c81f0911520e1bd8ae24c94e2e8852750c. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QM4TW1570420 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca12b114bc570674b1b1ba3d20e484bab446bc1484e0e3d864faff0ec8c45fae. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM4TW1570421 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba93838cab89a842bf5c3a192ec87d8b547c356db22b0d32291e08c7cc2254cf. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QM4TW1570422 — a six-check JSON result.
Sonata a Mandolino Solo e basso in D Major: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5d8eea7a1c67ddb296896f50918f11bda53fe6553f2504b8e91aa9ad79a528. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QM4TW1570423 — a six-check JSON result.
Sonata a Mandolino Solo e basso in D Major: II. Larghetto grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea0226664577a4cb94467bdce8e12f5135cf9c1ac02ec66a833ce388d9714fe. 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/QM4TW1570424 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25c87f28c874adb18fcbee4e1235f5a4870694cad342047e4bd463ee43a94b8. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/CAJ722486821 — a six-check JSON result.
Arcangelo Corelli: Sonata X Op. 5 in Fa maggiore. Preludio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f91a64b2f64c5af30022f4e8c6fd08f7246aa1c6ae11fb5c76406f2f79c2e28. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V80538337 — a six-check JSON result.
Arcangelo Corelli: Sonata X Op. 5 in Fa maggiore. Sarabanda
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c86cb095ab9856e8fffc961d2feb36b8c138faf59c6973ce5946fbfb01de80c. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/FR6V80538339 — a six-check JSON result.
Arcangelo Corelli: Sonata X Op. 5 in Fa maggiore. Gavotta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d80226e6dc11681f5425d97a7de54855548bfbd88b7eecd36dd9a837220aa6. 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/FR6V80538340 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb27fcd3af5c950ed83ba75e8d9044961179533107ba6e3e91450f9203866ceed. 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/FRZ171001660 — a six-check JSON result.
Gimo-Samling: 18th Century Sonatas & Trio Sonatas for Mandolin
Gervasio, Barbella, Cocchi: The manuscripts for mandolin of Gimo collection