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 0x1a055da741edac6a24e3ccb8c8f86f496ff15153ed3c4bd64c4b147242b76843. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dd98567e-88ff-4fe3-b7bd-106fe86d3f37.json and https://artists.proofprofile.net/proofs/artist/dd98567e-88ff-4fe3-b7bd-106fe86d3f37.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Albicastro, H.: Concerti A 4, Op. 7, Nos. 1-12
Concerto a 4 in F Major, Op. 7, No. 1: II. 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 0x5b942814fa8dfda5374233565b8ef8e6649fcb5e3b5f73d23a162c0b820c0538. 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/CH1490012402.
Concerto a 4 in D Minor, Op. 7, No. 2: I. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a2f9b5fb8d7955095c12caecab17a6c73956d1ea270593230adcc3e1741db2a. 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/CH1490012405.
Concerto a 4 in C Major, Op. 7, No. 3: III. Tremolo, Spiccato: Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11620aa42f8e1ae41dc7d81805e7990fed8a275a5594249465ee6f28a3034a06. 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/CH1490012411.
Concerto a 4 in C Minor, Op. 7, No. 4: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae15c5bb7bf57b82ff34c109cdd7ca98feb3ad192578d2882ea48e4fc86f098a. 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/CH1490012415.
Concerto a 4 in B-Flat Major, Op. 7, No. 6: III. Grave e spirituoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce98f1f10ffa8d3115ff2c672de00bdf4065eeb293823175e883819f100aaa78. 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/CH1490012424.
Concerto a 4 in F Major, Op. 7, No. 1: III. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3690471d9a206196b985f75788798c76f7b596f8348b172ad626988d9be21e26. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CH1490012403.
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
Concerto a 4 in C Minor, Op. 7, No. 4: I. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x855f2fa18f6d2f4dad30f1fda2340ddcff272d7f25c3256f02a1f34f7ea9845b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CH1490012413.
The Di Martinelli Manuscript: Violin Sonatas of the Late 17th Century
Treasures: Chamber Music from the Collection of Earl Rudolf Franz Erwein von Schonborn zu Wiesentheid
Recital of Swiss Composers for Violin & Harpsichord