Jörg Ewald Dähler (16 March 1933 – 3 November 2018),Der Bund was a Swiss conductor, harpsichordist, fortepiano player and composer. Life Born in Bern, Dähler, son of the reformed pastor Karl Walte
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 0x4bc858dced3a2d977f821a0a1fdc0283b743701ff0e8c8dedafe96d74601450b. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cf9cd966-1ad6-4a91-901f-a153115409a8.json and https://artists.proofprofile.net/proofs/artist/cf9cd966-1ad6-4a91-901f-a153115409a8.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Franz Schubert: Impromptus op. 90 / Impromptus op. posth. 142
Fantasias for Virginal, Cembalo & Hammerflügel
6 Concerti Armonici (Formerly Attributed To Pergolesi) / No. 1 In G: 4. Allegro
Wassenaer: 6 Concerti Armonici (attrib. Pergolesi)
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 0x15600a84632a4e03316091208546b41c8dd10fa306859a7748b992718c1d192f. 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/DEF058000484 — a six-check JSON result.
6 Concerti Armonici (Formerly Attributed To Pergolesi) / No. 5 In B Flat: 2. Da Capella. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b982888d26c1f7ab6a0f24e91af44e4559ed0107ded7b27bee15e7ba2f2fdea. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/DEF058000522 — a six-check JSON result.