thumb|Giovanni Guzzo, photo by Neda Navaee thumb|Guzzo Guzzo, photo by Neda Navaee Giovanni Guzzo (born 1986 in Porlamar, Margarita Island, Venezuela) is a Venezuelan violinist. Life and career Bo
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 0xfa3a8955be9d14e160272d6a78617e1b249c31475309e7bb2567b6923431b3af. Chain 2 (Bitcoin): anchored in block 954615 (2026-06-20T22:44:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c4c6382b-0ae4-4967-af49-acb9f431ef7f.json and https://artists.proofprofile.net/proofs/artist/c4c6382b-0ae4-4967-af49-acb9f431ef7f.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Piano Quartet No. 1 in G Minor, Op. 25: IV. Rondo alla Zingarese. Presto – Meno presto – Molto presto
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 0x1992c414fe9090422920061855d245e4d14db74e8ef0001793bb5eeefcfb9485. 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/HUA253283004 — a six-check JSON result.
For Clara: Works by Schumann & Brahms (Extended Edition)
Kreisleriana, Op. 16: No. 1, Äusserst bewegt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb9b7520a6e38ce9e4e56b487c7813bcce6b2c6de457cb77fd4523db2c96ffa8. 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/DEN962301411 — a six-check JSON result.
Kreisleriana, Op. 16: No. 2, Sehr innig und nicht zu rasch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a61f9414c29571cc97fa0cb127c16ac0f2195b281bde5741b7b5f9fbd600725. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/DEN962301412 — a six-check JSON result.
Kreisleriana, Op. 16: No. 3, Sehr aufgeregt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69cc7f4d792aef1b14c1e38e67c5e19e62eb7f9496290b79564b168fb4c34116. 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/DEN962301413 — a six-check JSON result.
Kreisleriana, Op. 16: No. 4, Sehr langsam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd549f9f895d123cc1d0772dc8484fc7b79b99a55c07ca3fbd89b4149248e3504. 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/DEN962301414 — a six-check JSON result.
Kreisleriana, Op. 16: No. 5, Sehr lebhaft
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfec3a6291f9905c74d3e358f1cb1b320db2aae48dbfc5563b964f26d04e2a094. 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/DEN962301415 — a six-check JSON result.
Kreisleriana, Op. 16: No. 6, Sehr langsam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f28077b4adb513a640f55daca13a71c95f2b9a3c25565b9d926ae651c8f3d9. 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/DEN962301416 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5ef728bc812208c6ff75c0b607013c069c86f63b0d113d8afd86668f3b309b3. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEN962301417 — a six-check JSON result.
Kreisleriana, Op. 16: No. 8, Schnell und spielend
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x954109e5701840b4abc4bcd916ce983db00ddda3f67c1736512b2362bdb421a3. 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/DEN962301418 — a six-check JSON result.
3 Intermezzi, Op. 117: No. 1, Andante moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x353142a518fa2a02c6c20ea99a20e89c416d59e904cfeaa474a4e4650b2c04e3. 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/DEN962301421 — a six-check JSON result.
3 Intermezzi, Op. 117: No. 2, Andante non troppo e con molto espressione
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e235cb7032f11858f413016e714801f8df3e58171aacb8a6ff2a3c0dd9eae9c. 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/DEN962301422 — a six-check JSON result.
3 Intermezzi, Op. 117: No. 3, Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6fdf8db5bcbb4a49c388c211545a8be8133784839782de363c6437c6886d573. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/DEN962301423 — a six-check JSON result.
9 Lieder und Gesänge, Op. 32: No. 1, Wie rafft ich mich auf in der Nacht
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa37e0aafb5af7f2e57c61fe5c1d7180d3c57891b0209080f2fddcad30d680f22. 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/DEN962301431 — a six-check JSON result.
9 Lieder und Gesänge, Op. 32: No. 2, Nicht mehr zu dir zu gehen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e6b4935f872ecb1be96d009b515fe3066da43752209f3727ce253a0b253b10. 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/DEN962301432 — a six-check JSON result.
9 Lieder und Gesänge, Op. 32: No. 3, Ich schleich umher
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842a07976d1cfb21bfd0552ef4dcec681749a2e2200269b09c7c7e2626e6eee4. 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/DEN962301433 — a six-check JSON result.
9 Lieder und Gesänge, Op. 32: No. 4, Der Strom, der neben mir verrauschte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc400737eeedbbf3231f2611989e7c9355024615a603451b25d7a4f2f39bb5881. 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/DEN962301434 — a six-check JSON result.
9 Lieder und Gesänge, Op. 32: No. 6, Du sprichst, dass ich mich täuschte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312d608fe6e63f32dea27ddafa6786b5cd576698f507faf31bca3ea1439a48be. 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/DEN962301436 — a six-check JSON result.
9 Lieder und Gesänge, Op. 32: No. 7, Bitteres zu sagen denkst du
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4410fd7d47a287f45024c531697e9aee7e1062f97fb312d567adaf2bcf09aa89. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DEN962301437 — a six-check JSON result.
9 Lieder und Gesänge, Op. 32: No. 8, So stehn wir, ich und meine Weide
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fedf62ca54ba2ec7172e753232bd3176190f915375302c92d780d38360f2844. 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/DEN962301438 — a six-check JSON result.
9 Lieder und Gesänge, Op. 32: No. 9, Wie bist du, meine Königin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90bd061e3b9b5ae7c08119c0a98d67d9b0c2464874a8eba55a3ac2e2a8a3337b. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEN962301439 — a six-check JSON result.
Piano Concerto in A Minor, Op. 54: I. Allegro affettuoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65450404457288f049e2c1e79a93f31c107cc1e420e53d9fda45fcf47afde9fe. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/DEN962303131 — a six-check JSON result.
Piano Concerto in A Minor, Op. 54: II. Intermezzo. Andantino grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf8341ca8052d23d6a30be6bffdc3dfa61b4480ba50ed3b932304cf695f84e8. 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/DEN962303132 — a six-check JSON result.
Piano Concerto in A Minor, Op. 54: III. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bb7ee3f8c4d0b76a17f81eca1f49f04add153d42bcb16fc1f1b1693b4a116da. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/DEN962303133 — a six-check JSON result.
Faure, Poulenc and Franck Violin Sonatas
Schumann: Piano Concerto in A Minor, Op. 54: II. Intermezzo. Andantino grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf8341ca8052d23d6a30be6bffdc3dfa61b4480ba50ed3b932304cf695f84e8. 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/DEN962303132 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24adb04b2919d582fb60018d93ff638560c9a21d9a972698b7da87b82a0ec9a. 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/GBELX1204288 — a six-check JSON result.