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 0x7d0a93be4fd76aef5dc9ae6a3b6580aee63650bfe0d7952931c2f4cf2354acad. 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/f6270fd9-a4b5-4b38-9f9f-55c9f31f7b0c.json and https://artists.proofprofile.net/proofs/artist/f6270fd9-a4b5-4b38-9f9f-55c9f31f7b0c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Mozart: Eine kleine Nachtmusik, Divertimento - Tchaikovsky: Serenade for Strings
Martinu & Janacek: Czech Music 20th Century
Janáček: Suite for Strings - Martinů: Partita, Serenade No. 2 - Kalabis: Diptych for Strings
Czech Suite in D Major, Op. 39, B. 93: I. Preludium. Allegro moderato
Dvořák: Serenade for Strings, Czech Suite
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 0x825df40be9e143781aff96c5329840d54f7f7f21e49d95a7613b2e5720e73c33. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CZA167701330 — a six-check JSON result.
Czech Suite in D Major, Op. 39, B. 93: II. Polka. Allegretto grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe69408dc210eda73366d3bfbaa399dab37cb0cb0be5af9839eb35d544b65e9. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CZA167702330 — a six-check JSON result.
Czech Suite in D Major, Op. 39, B. 93: III. Sousedská. Allegro giusto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8048b0fd82f543c91274ff08d980939f006109c483f2dbfe33263c4346775908. 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/CZA167703330 — a six-check JSON result.
Czech Suite in D Major, Op. 39, B. 93: IV. Romanza. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6976f0de0860b227dc75c613a79754ae0078c1713022823f99a8e5f9c6e6060. 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/CZA167704330 — a six-check JSON result.
Czech Suite in D Major, Op. 39, B. 93: V. Finale. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30dbf7d80d5e30efb7e5df0c82d90f543fa2ca2d077c56ad8b8bda3e05ac0284. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CZA167705330 — a six-check JSON result.