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 0x8573712dc95f3ec456a0d0f98edbf9673dbfd22bb984730c75850c9fe208a175. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c22c13af-9464-4c86-88f1-a1585973ffd4.json and https://artists.proofprofile.net/proofs/artist/c22c13af-9464-4c86-88f1-a1585973ffd4.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Sonata K. 24 (Arr. for Two Guitars by Matteo Mela & Lorenzo Micheli)
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 0x123bb2fc6e905c770b9b786d5e414daa85ef715ab8582d7585931ed0136bed90. 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/FROV62210701 — a six-check JSON result.
Sonata K. 99 (Arr. for Two Guitars by Matteo Mela & Lorenzo Micheli)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf20a117b3ce61fa36afbe6e571616a85728b06cf78fe37099b53806b94a28023. 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/FROV62210702 — a six-check JSON result.
Sonata K. 455 (Arr. for Two Guitars by Matteo Mela & Lorenzo Micheli)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43b83e3c6f191eae6968f7739b837e747851dc7d3b76037af0650d760f918896. 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/FROV62210703 — a six-check JSON result.
Sonata K. 87 (Arr. for Two Guitars by Matteo Mela & Lorenzo Micheli)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c469cf26f1f9ab21a009aef4618aa8c1ccd1aeaeb5b89697950322542b511f. 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/FROV62210704 — a six-check JSON result.
Sonata K. 162 (Arr. for Two Guitars by Matteo Mela & Lorenzo Micheli)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a319ccb8fce1e161fd5406860fe2fedcb32d987fe6148f3f1035bb70bd564f. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/FROV62210705 — a six-check JSON result.
Sonata K. 32 (Arr. for Two Guitars by Matteo Mela & Lorenzo Micheli)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ad37e031d3185fd23375ed6f395de606a6a563661c2de0cce6179e4f4c1db5. 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/FROV62210706 — a six-check JSON result.
Sonata K. 531 (Arr. for Two Guitars by Matteo Mela & Lorenzo Micheli)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94bd76529d49657bb660001c442f13c9493960119ac0dcf69d45c0df28aa06c3. 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/FROV62210707 — a six-check JSON result.
Sonata K. 519 (Arr. for Two Guitars by Matteo Mela & Lorenzo Micheli)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde765f3f77f1433353f149c731eb5b29903ce2301d3d8da94cbbaa1c5afacfe1. 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/FROV62210708 — a six-check JSON result.
Sonata K. 202 (Arr. for Two Guitars by Matteo Mela & Lorenzo Micheli)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde820ff9f2ff890e5eecf14718ec359753353128255b317039376e283d14a49f. 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/FROV62210709 — a six-check JSON result.
Sonata K. 466 (Arr. for Two Guitars by Matteo Mela & Lorenzo Micheli)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9118e2023ecb4d3f8a3be0292d640731cce8253d9b3ec962ce3a4ec6aaf5238. 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/FROV62210710 — a six-check JSON result.
Sonata K. 8 (Arr. for Two Guitars by Matteo Mela & Lorenzo Micheli)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6506b0ae7dce1857f8702427e7b0f073823a572e8b6bcfd01752e856c98e27ae. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/FROV62210711 — a six-check JSON result.
Sonata K. 386 (Arr. for Two Guitars by Matteo Mela & Lorenzo Micheli)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb773488af2820d38312a0982360efe11e4133b3f97b460be92fbe8375bd3561f. 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/FROV62210712 — a six-check JSON result.
D'Intavolatura di chitarrone, Libro 4: Canario
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b209bf8da0afbf28d80b2d83d56c832d217088c943ad75408afe42f9a90880. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/ITJ090800103 — a six-check JSON result.
Lhoyer: 3 Duo Concertants, Op. 31 - Duo Concertant, Op. 34, No. 2
Cantabile in D Major, Op. 17, MS 109 (Version for Violin & Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc95e05482c38df50d7d73e890d73ee0d19de4058e431c49ae3f63b70b8ced5e0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITN321817300 — a six-check JSON result.
Scienziati musici nel Rinascimento e nel primo Barocco
Lhoyer: 3 Duo Concertants, Op. 31 / Duo Concertant, Op. 34, No. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9dfd3dd0e7119fff5c79ebfb3d0e394f466251762cfabed71ca33106b9c749. 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/ITJ090600001 — a six-check JSON result.
Italian Virtuosos of the Nineteenth Century
Guitar Quintet, Op. 143: I. Allegro, vivo e schietto
A. Scarlatti: Clori, Ninfa e amante, Arias & Cantatas
Turina, Castelnuovo-Tedesco: Souvenir d'Espagne