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 0xae6419efdf34a588c949be21f35108e07ead1ca0686436193d8d79541080d4d8. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8e785f22-4bc6-4271-9708-71155e9ded3d.json and https://artists.proofprofile.net/proofs/artist/8e785f22-4bc6-4271-9708-71155e9ded3d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Giuseppe Verdi & Giacomo Puccini : Quartetti (Quartetto di Roma)
The Four Seasons, Violin Concerto No. 1 in E Major, RV 269 "Spring": I. 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 0xc3a19ba111fc0524646fe60047e172c23e9e706628841c6b3a40c6269fbef1dc. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBC2100617 — a six-check JSON result.
The Four Seasons, Violin Concerto No. 1 in E Major, RV 269 "Spring": II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9684056c613d9481ab7424c8a8ac0b60b6efc187c381e58372e808dfc63620. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBC2100618 — a six-check JSON result.
The Four Seasons, Violin Concerto No. 1 in E Major, RV 269 "Spring": III. Allegro. Danza pastorale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbad52295bd2141e8ea1b6eadf02f39d6440739a050d67547dc514463968c991d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBC2100619 — a six-check JSON result.
The Four Seasons, Violin Concerto No. 2 in G Minor, RV 315 "Summer": I. Allegro non molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a945ec7bacb2924ade33e65e13b04903080363421dce48c6eda81dc4b9df55b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBC2100620 — a six-check JSON result.
The Four Seasons, Violin Concerto No. 2 in G Minor, RV 315 "Summer": II. Adagio - Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aab7de4f19edb067197211c0e42e9911535a3e2678395ee32d031be3c4d539c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBC2100621 — a six-check JSON result.
The Four Seasons, Violin Concerto No. 2 in G Minor, RV 315 "Summer": III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa085264440bff42dd5175dea54de7ca7752fcdd51af552f41484213e0acf37. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBC2100622 — a six-check JSON result.
The Four Seasons, Violin Concerto No. 3 in F Major, RV 293 "Autumn": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbaedc3735025b2d546f6970b24e607a75236c8e4b844bbc0d8f4a8d0f7d729. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBC2100623 — a six-check JSON result.
The Four Seasons, Violin Concerto No. 3 in F Major, RV 293 "Autumn": II. Adagio molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aca865feace3c9bf47d55f3c425a30ff168d22e74325f5481b85eb21f9ad1e1. 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/GBBBC2100624 — a six-check JSON result.
The Four Seasons, Violin Concerto No. 3 in F Major, RV 293 "Autumn": III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa17616cc4a1a20ced216ce07a60c57873d22e88889796f7ef089dc24df69b36d. 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/GBBBC2100625 — a six-check JSON result.
The Four Seasons, Violin Concerto No. 4 in F Minor, RV 297 "Winter": I. Allegro non molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd648371dcb00847f6d95dcd9c7b0ae3328df380fceaed0fd377b3696896730. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBC2100626 — a six-check JSON result.
The Four Seasons, Violin Concerto No. 4 in F Minor, RV 297 "Winter": II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6595895d1d631809aa4af69e5ffb458418f3c78e5fc6843e93f8df159910cdb3. 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/GBBBC2100627 — a six-check JSON result.
The Four Seasons, Violin Concerto No. 4 in F Minor, RV 297 "Winter": III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcbf9bc05e35fb4e6066084cb6fc8664ce1bcf6cb9026bc962d92446eb04b789. 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/GBBBC2100628 — a six-check JSON result.
I vespri siciliani / The Four Seasons: I. Winter (Transcr. Luigi Pecchia for Strings and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef49665511b02bf73771d71a1aae856fac0e910890885775efd9dcea5d2d4b1. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBBBC2100629 — a six-check JSON result.
I vespri siciliani / The Four Seasons: II. Spring (Transcr. Luigi Pecchia for Strings and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a53ed949d55821e64b4daea40030764008a8db28bbdfd615eb54081d1ebc273. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBBBC2100630 — a six-check JSON result.
I vespri siciliani / The Four Seasons: III. Summer (Transcr. Luigi Pecchia for Strings and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a3518a2765b1d0467dbe11bd86567f34ae04032c177b0232328204fe7a6a0a. 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/GBBBC2100631 — a six-check JSON result.
I vespri siciliani / The Four Seasons: IV. Autumn (Transcr. Luigi Pecchia for Strings and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35b4a02a12bc63c18803e992fb3ea81c150ae7fe331cc42fd91f968ebc17591b. 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/GBBBC2100632 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a19ba111fc0524646fe60047e172c23e9e706628841c6b3a40c6269fbef1dc. 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/GBBBC2100617 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9684056c613d9481ab7424c8a8ac0b60b6efc187c381e58372e808dfc63620. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/GBBBC2100618 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbad52295bd2141e8ea1b6eadf02f39d6440739a050d67547dc514463968c991d. 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/GBBBC2100619 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a945ec7bacb2924ade33e65e13b04903080363421dce48c6eda81dc4b9df55b. 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/GBBBC2100620 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aab7de4f19edb067197211c0e42e9911535a3e2678395ee32d031be3c4d539c. 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/GBBBC2100621 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa085264440bff42dd5175dea54de7ca7752fcdd51af552f41484213e0acf37. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBBBC2100622 — a six-check JSON result.