Francesco Cera (born in Bologna, Italy) is an Italian harpsichordist, organist and conductor. Accomplished performer of Italian Baroque harpsichord and organ repertoire, he was a student of Gustav Leo
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 0x73a45f6c1dfaff6c598eb263a8403b33d1fff9d66ef155d8cee96d4651ba3e3d. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d363c275-ab5d-4761-9479-fb5df3d43e4e.json and https://artists.proofprofile.net/proofs/artist/d363c275-ab5d-4761-9479-fb5df3d43e4e.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Toccate e partite d'intavolatura, libro secondo: Aria detta la Frescobalda, F 3.32
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 0x63004cb4f2e97046b92c1fe2f7d45ace4c06c01308c1d8acf380b4c70151b5fb. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FR46Y1846302 — a six-check JSON result.
Toccate e partite d'intavolatura di cimbalo, libro primo: Toccata terza, F 2.03
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe1824cc53843471ff6f811e0ad285b4ce93318934aebb17f9574e1df52725d3. 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/FR46Y1546308 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912a0141d1439d85ff4ce8d1f1f357e00faf49f5393ae9a8bc33571074cab57a. 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/NLY331510434 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed7e0a715ec15e3c90b04810dc05ad951a5352b1a0a96508160b10de3b81450. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/FR46Y2049201 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf105a08cbd66da3ac0fb530d40f8c5a9b27e62ebf3d9e585bb85da2c83bf6b. 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/FR46Y2049202 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace586f6d53dd42de40ee9c5cab48d6143ad34834693a70b2b64f2f11d56d12d. 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/FR46Y2049204 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61833041163024ac09e3caa7478107593712a6c4ffb62b8952e89860a84c9b6e. 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/FR46Y2049210 — a six-check JSON result.
Brunnenthal 1715 - Music for Organ & Cornetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dcb41efce82ca029e89b3be256b8868c574d3292a27c658bc872bac9f5a7105. 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/NLY331701843 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aabf497dade1bbfda2ddc660bfe9c08099e04556767f753e4dcd5463af485f1. 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/NLY331701845 — a six-check JSON result.
Ghirlanda Sacra - Il Mottetto a voce sola a Venezia
Colonna: Nisi Dominus - Mottetti e Lamentazioni
Scarlatti: Keyboard Sonata K. 124, 144, 153, 6, 9, 187, 490, 492 - Cantatas "Che Vidi, O Ciel, Che Vidi" - Alla Caccia, Alla Caccia"
Gesualdo: Quarto Libro di Madrigali a 5 voci
Scarlatti and the Neapolitan Song: Canzonas and Sonatas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42903a80ff8135aacab972c4d8f9826631da9362500aec1dfd3d5b2fab738adf. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/NLY331301901 — a six-check JSON result.
J.S. Bach: The Well-Tempered Clavier, BWV 846-893
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e1cf5ee8fbd378ccabda61326a78a332d153979b4322c863eed8441792d979d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ITN322320993 — a six-check JSON result.
Prelude & Fugue in C-Sharp Minor, BWV 849
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa784851c4439466f3dd799b1f0bfe47e7f567c53dae556b9a3eca4b73a55175f. 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/ITN322320996 — a six-check JSON result.
Prelude & Fugue in F-Sharp Major, BWV 858
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ad6bf3c6807907e581c539bf842c3819dc09efbfcf36ea1d7998b80a95d0340. 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/ITN322321005 — a six-check JSON result.
Prelude & Fugue in F-Sharp Minor, BWV 859
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0049bc0d7431af35eb54b598800d3fb483e8e5cdd52930d12add56443b36604c. 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/ITN322321006 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4933680484816f52ab5c6cb3415ae45939adc4be3746e47bd34026e24ac1b471. 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/ITN322321035 — a six-check JSON result.
Storace: Selva di varie composizioni d'intavolatura per cimbalo et organo, Venezia 1664
Suite No. 3 in D Minor: VI. Sarabande. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bbbd251dcb47d9f18d519ffdb8a2e588f1b278da3cf924e93fe5edb89e653f1. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLY331405284 — a six-check JSON result.
Storace: Selva di varie composizioni d'intavolatura per cimbalo et organo
Scarlatti: Sonate per cembalo, 1742, Vol. 2
Scarlatti: Sonate per cembalo, 1742, Vol. 1
Rossi: Toccate e correnti, parte seconda
Selva di varie composizioni d’intavolatura per cimbalo et organo
Scarlatti: Sonate per cembala, 1742 - Vol. 3
Rome Baroque - De Pasquini à Haendel (orgue G. Gugliemi de l'église Santa Maria in Vallicella à Rome)
Storace: Selva Di Varie Composizioni - Parte Seconda
Scarlatti, D: Mandolin Sonata in D Minor, Kk. 90: I. Grave
The Collected Recordings of Il Giardino Armonico
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x171cea659eff0b50e1f8af27d7c3f665bab67d7b17088d0323a47447a21e07df. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DEA809316101 — a six-check JSON result.
Scarlatti, D: Mandolin Sonata in D Minor, Kk. 90: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1199049fe93c2232355f7ddb76dcba09fd5a606136846bc1f099ac0d2772550a. 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/DEA809316102 — a six-check JSON result.
Scarlatti, D: Mandolin Sonata in D Minor, Kk. 90: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef5ad102d42e082509180450f76051174232723cb9d4a83accf88a7b56ec30e. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/DEA809316103 — a six-check JSON result.