thumb|Self-portrait photograph Federico Maria Sardelli (born 1963 in Livorno) is an Italian conductor, historicist-composer, musicologist, comic artist, and flautist, resident in Florence. He founded
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4b16e8f9f00d38b5e604b0b496b7c8782789998097f552f02cb774d6c7841fd. 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/e48c0f75-ba45-4ff1-859c-75dc46de8b45.json and https://artists.proofprofile.net/proofs/artist/e48c0f75-ba45-4ff1-859c-75dc46de8b45.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Italian Operatic Overtures, Vol. 1: The 18th Century
Concerto in D Major, RV 781: I. Sinfonia. Allegro
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a904d7b26529c267348a88fe1439992c1450386e39c2c1eb6026a68230f886. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131215011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d9d97ab665b97d60ff51ca1e0329cc9c15cfc06cd27d5591d8efed1e3515c39. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131215021.
Concerto in D Major, RV 781: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe91105572df60fed14bbfaef834906ca9cfe6f7dfc22ac46a330c0fb18f9a0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131215031.
Orlando furioso, RV 819, Act II, Scene 6: Io sembro appunto quell'augelletto (Aria)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615d0f18236b9a63b80a8f430ed5217889617505d95998e398f3f6b04f8e0ca8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131215102.
Orlando furioso, RV 819, Act I, Scene 5: Nel profondo cieco mondo (Aria)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc576bd0d8738c6ff8bc37dc44fb80b1b222b94f000141f50829e7ddf7f58b24f. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131215131.
Orlando furioso, RV 819, Act I, Scene 11: Porta il sol del tuo sembiante (Aria)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7757b901c8eedff5ab098bd814f98d55f4c715a0e4458c6770567f6947c543e7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131215211.
Orlando furioso, RV 819, Act I, Scene 12: Non muore il fiore (Aria)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bf0173e8875a31fc62b01439613eefa06e72576ef6c22aba7a87e5124cb171e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131215231.
Violin Concerto in D Major, Op. 4 No. 11, RV 204: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa32eb44fbc1c234b0c1d6fedbf71f59a5598b2c379239617af8d2d624508236. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITN321917799.
Orlando / Act 3: Sorge infausta una procella
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72acc26890b7fdcbc5246e634ead48bbd8a31c6dbf5a3ef4d75e993e2880c62c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960900430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7623438ffb80d65cdc9df5f62d25a2b69b769e3659d71d26444388a6a3a2836d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960900450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94cf1ec9e5cda262a3c588cf1765cd18acd9338dfbb3e1739085408d1f1f0f8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX290700341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8d76b1c5fe97a8ee0aa4bea8cce4c35bd3e578b400b6c91d1fb5f392ac3680f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX290700342.
Atenaide, RV 702: Aria "Ti Stringo in Quest'Amplesso"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc45399f70602e2c45121921b86e73ccb430e61ac494d1f8daf26e718faddc812. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX290700360.
Vivaldi: Arsilda, regina di Ponto, RV 700
Concerto for Flute and Strings in D Minor, RV 431: I. Allegro non molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83196fbee92aaf0eb83d64e9a43ca4bcc0ef09754ebb01033ad70a9fc61fd6fe. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131127011.
Violin Concerto in A Major, RV 817: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd142290822017e48140c19b3924211d848e2dc1c685ce7bd1f0583b4f813b4d8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131127016.
L'inganno trionfante in amore, RV 721: Langue il fi or su l'arsa sponda
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7aecd616f1f96297448698a52e0156174d25d3fe16225146f8c2f5a052aa303. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131127020.
Violin Sonata in D Major, RV 816: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21342819a73fb2f1aaca44a32e65ccef169585a3c877063b55f0afdd0bf5f2da. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131127022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72acc26890b7fdcbc5246e634ead48bbd8a31c6dbf5a3ef4d75e993e2880c62c. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960900430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72073e7780bd0aeb9626ba61057eb8286c31d83497fec85489a345c3a224bd48. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITD551014309.