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 0xdbc35b21044f1b012f9151904f5e3c407199e75b2bec99e37960a5f8bd196657. Chain 2 (Bitcoin): anchored in block 953701 (2026-06-14T22:16:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/756a4bf2-73d6-40e2-9afb-b4d19e079b70.json and https://artists.proofprofile.net/proofs/artist/756a4bf2-73d6-40e2-9afb-b4d19e079b70.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Light and Darkness - C.P.E. Bach: Flute Sonatas
Flute Sonata in E Minor, H. 551: 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 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 0xf531170d187157fe61615fc79cc1d13888f6093d51e53bf1543a9ee271f25e6b. 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/FR46Y2053714 — a six-check JSON result.
Sinfonia per violoncello in G Minor: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e715fb0c8114b5794ca86f8bbf3f0726db17476cd34b3b4791fd2473bd120e. 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/FR50X2082601 — a six-check JSON result.
Sinfonia per violoncello in G Minor: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x988841e6f0f42d2b21413bd0bc56342049a02f3e2f50754b6d93d3ee6378556d. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/FR50X2082602 — a six-check JSON result.
Sinfonia per violoncello in G Minor: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd682bd2987ed3dfe3e7ebe6ca7bffad5e029aad25d9cd6548269594d53cc7062. 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/FR50X2082603 — a six-check JSON result.
Sinfonia per violoncello in G Minor: IV. Minuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ca54fd4683a10f04767639c6056887fb695a6e798b122b5e70597923f97a34c. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/FR50X2082604 — a six-check JSON result.
Sonata a violoncello solo in G Major: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac2f4808191e0469fe1e0bc9c7613df35fc88ebba9fc7ee0d0f6e3bcf838b57c. 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/FR50X2082605 — a six-check JSON result.
Sonata a violoncello solo in G Major: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db3c86f43ee705eb82f249d60f07c588f47dbf2515c65e06c564aebd8418af1. 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/FR50X2082606 — a six-check JSON result.
Sonata a violoncello solo in G Major: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b84f008de3f2334556b0857daf5d9a72146a9b809ce966cc7dd50b657a1c86a. 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/FR50X2082607 — a six-check JSON result.
Sonata a violoncello solo in G Major: IV. Sarabanda
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf251efd487f93519695e15cc6d532dffb91e4b4cdcbd6fdbd2bbe1f75b44a387. 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/FR50X2082608 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x505397fa31ed0ea248a171de069e7858a153010d45668c5c961962610b9076ec. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/FR50X2082609 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d143016c9292f914f45ffc5a6d434fe92026e2ed091be1eef33a527858283ec. 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/FR50X2082610 — a six-check JSON result.
Sonata in A Minor: III. Minuetto - Grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644cd782c58ae4311954f898583f64f5a0d6dfe23e675db88194d9fcb7d70970. 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/FR50X2082611 — a six-check JSON result.
Sinfonia per violoncello solo in D Major: I. Largo - Allegro - Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03a7d78a5e7750d1ead51565d3491acaa4b5a07b6b403bf521e483778f53ae0. 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/FR50X2082612 — a six-check JSON result.
Sinfonia per violoncello solo in D Major: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaee3e5cfc87e40d0ab54ffad95a42343d3c62f563416c30ebeec1a85c963fbf8. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/FR50X2082613 — a six-check JSON result.
Sinfonia per violoncello solo in D Major: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8b3859b19b481c0cd99cfaa7fda953a2cd860910d623ee63483adcd615e031e. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/FR50X2082614 — a six-check JSON result.
Sinfonia per violoncello solo in D Major: IV. Minuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3308e7625e71ec96a78b6350465b85cb02216e8ca569425f451fcbd329eac64. 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/FR50X2082615 — a six-check JSON result.
Sonata da camera in A Major, "La Comodina": II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ffe07e530262b9b80b303efc43bf07d5695815f6c383ce5be4c5a09ff6c6faa. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X2082617 — a six-check JSON result.
Sonata da camera in A Major, "La Comodina": III. Affettuoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc534384b98d0bbe27d81fd1c97ef479b37e7058c2bb6d75773f506264d5ac1f. 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/FR50X2082618 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x000657688b010a3834e2b1ec50d1a7c2b2aa1eda382348b5c0e203884d27a082. 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/FR50X2082619 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x488d28376f801a9d16531ef3707cab34dcc178db55ef1941906c2c30bdb2e9f9. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/FR50X2082620 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2744b131817a1ed138e98b35bafb64cd3694b8ecbf414bacdb357ab3ff67296d. 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/FR50X2082621 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c2f0f350d208530d492f936c9ff54823e4f2852c6bbdbcd1d0254525626ee83. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/FR50X2082622 — a six-check JSON result.
Sinfonia per camera in C Minor: I. Cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f5e4058e36d6f4cb18b437782739bba7bc1a0a4d6c3909dbc081ba3ed8f3d7. 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/FR50X2082623 — a six-check JSON result.
Amor, di che tu vuoi: II. Aria "I begli occhi del mio bene"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60731ccda89ee1f8e786fee2d654fe397c42c8f543f10f1719147d749eb497d0. 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/FR50X1740602 — a six-check JSON result.
Amor, di che tu vuoi: VI. Aria "Mirate le mie piaghe"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa75315cf39e19169206074f07d7e4ca02295d01c7a0ac799490e0df396967cc0. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/FR50X1740606 — a six-check JSON result.
Vivaldi: Cello Sonatas (Alpha Collection)
Cello Sonata in B-Flat Major, RV 46: II. Allemanda (Allegro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8c1516fd4f4619d79a15de8ef4ca2b147ee80fa5309f6c39848ecf0b5b32dc. 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/FR1P71433802 — a six-check JSON result.
Cello Sonata in A Minor, RV 43: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f6f4219cc16fc97ef0a587aeac2b305767e4483cc2cbf66b712482620602c1b. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR1P71433807 — a six-check JSON result.
Cello Sonata in G Minor, RV 42: III. Sarabanda (Largo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7edf21da8851cdd3f51e1f2328840f8d6ce1363fcfea5710063aab66ff8d9dd1. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/FR1P71433811 — a six-check JSON result.
Cello Sonata in E Minor, RV 40: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61681f09aaa4d67368ee9429e22f3ecabf5f2510e6e6abda87b29478b36c3a0a. 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/FR1P71433822 — a six-check JSON result.
Cello Sonata in E Minor, RV 40: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5307583118474bf036909002478768134dbafe1dbc4957e7df5ef4d40ec2f37b. 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/FR1P71433823 — a six-check JSON result.
Cello Sonata in E Minor, RV 40: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f751c9394ffcf84af0789f6cd560fc1da0ab14c1401d0f753287ab208ce031. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/FR1P71433824 — a six-check JSON result.
Boccherini: Cello Concerto, G. 480, Quintets, G. 451 & 436 & Sextet, G. 463