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 0x92783e7a660f8ebeb2ef4895d97c0ab85f028d8a616ec503211f3b9e8138fd12. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b4b9d764-357e-43af-be57-66f7d530f927.json and https://artists.proofprofile.net/proofs/artist/b4b9d764-357e-43af-be57-66f7d530f927.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Concerto for 2 Oboes in C Major, RV 534: II. Largo
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 0xf36ac7e154e95dbbc99c1382a3dd5287865baad25f0a1cc45feb6fa339a4391c. 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/HKI199329005 — a six-check JSON result.
Symphony No. 9 In D Minor, Op. 125, "Choral": IV. Finale: Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5604ae7ecf13312685a6bd789b045b766ce3950aed68068e7a702943910c6d9. 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/HKI199700704 — a six-check JSON result.
Symphony No. 9 In D Minor, Op. 125, "Choral": I. Allegro Ma Non Troppo, Un Poco Maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa59f50f485b7383dce80fec6593dec6ed28126843eb4c67186ee0f4375b7546. 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/HKI199700701 — a six-check JSON result.
Symphony No. 9 In D Minor, Op. 125, "Choral": III. Adagio Molto E Cantabile - Andante Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43d47b4a0d24739e97d4c5ff108cad8ab4a964a8ade9adfa37b3d1397de6a581. 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/HKI199700703 — a six-check JSON result.
Symphony No. 9 In D Minor, Op. 125, "Choral": II. Molto Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef33d45b718c39de912276a6e029ce3c4752aa066c3d0dabdd2de59043788f5. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/HKI199700702 — a six-check JSON result.
Symphony No. 5 in C Minor, Op. 67: I. Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x889e112f056df6ded923444a464d44833eca10ab6a71a8985d59f93ad7bbc776. 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/HKI199626405 — a six-check JSON result.
Bassoon Concerto in C Major, RV 476: I. Allegro
Vivaldi: Bassoon Concertos (Complete), Vol. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80b760476fb348475b8ada0db0d1ba141b97ec727630b1afc40c9a39b45e722. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/HKI190245401 — a six-check JSON result.
Bassoon Concerto in A Minor, RV 498: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b66215cbbe235a3edf59ba408a50867bfd3086a95e09d29e10fc06b69dd5a87. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/HKI190245410 — a six-check JSON result.
Bassoon Concerto in C Major, RV 476: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772de5bb4694cc46b6089904ffae175dbaefe2c11e095da1df38b75334a5dd98. 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/HKI190245402 — a six-check JSON result.
Bassoon Concerto in C Major, RV 476: III. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53be854ffc64d8942051f20cbef7269c07732b9a3d3ffa3b2649a4523187cfeb. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/HKI190245403 — a six-check JSON result.
Bassoon Concerto in F Major, RV 487: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0057e091984224af23a956ec13b80994ca9e487064c0c2405894b858eb42d77. 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/HKI190245405 — a six-check JSON result.
Bassoon Concerto in A Minor, RV 498: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73885c02a75b10b1d4a2dbad91dab32cbea085e55d84cb10e5517e8f4174b33. 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/HKI190245411 — a six-check JSON result.
Bassoon Concerto in C Minor, RV 480: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d2b39e50a1f6b3206868a09278510b4b4098a4367a9782621b1c381791d7c39. 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/HKI190245413 — a six-check JSON result.
Don Giovanni, K. 527, Act II: Don Giovanni, a cenar teco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf627f97f5a968fecf7ee65565414bf36a8e974e5c5c26ce0bf897c7e266d83d. 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/HKI190136514 — a six-check JSON result.
Bassoon Concerto in F Major, RV 487: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a428c152ed82e8dacec45fac3bbd977ec6b2e039850a3f8797c287c38109dd. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/HKI190245404 — a six-check JSON result.
Bassoon Concerto in F Major, RV 487: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6083893e7992c126dcfd541602704ed3af0dca82fccf7b2543db0fdb9b8bae7d. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/HKI190245406 — a six-check JSON result.
Bassoon Concerto in C Major, RV 471: I. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf95b58716c6393201388b07ba59c381fbbc91a0112c631e3fe3f31495e885932. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/HKI190245407 — a six-check JSON result.
Bassoon Concerto in C Major, RV 471: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf2792d0714b8f3d02f5db50d77e7bb62feb5701ab2545f9eac926b84f613a4. 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/HKI190245408 — a six-check JSON result.
Bassoon Concerto in C Major, RV 471: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3c1a08abe967eca575878b8520ea9bcea7ab3ccf1b5cafcbe5d1ede6142bb5. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/HKI190245409 — a six-check JSON result.
Bassoon Concerto in A Minor, RV 498: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf27824bb8281d7da2f1348eae1dae4fb8594fd023d87c9604f4bca57202d15a8. 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/HKI190245412 — a six-check JSON result.