thumb|right|Peter Schmidl Peter Schmidl (10 January 1941 – 1 February 2025) was an Austrian clarinetist. Life and career Schmidl was born in Olomouc, Protectorate of Bohemia and Moravia on 10 January
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 0xa556d5a6d053f2b9c5b671bcc0f0be6660fe8d9cd3abd3ae2be0e9f847261ab9. 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/e2e2db16-9df6-41eb-a9a9-bdf6feac99ed.json and https://artists.proofprofile.net/proofs/artist/e2e2db16-9df6-41eb-a9a9-bdf6feac99ed.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Serenade for Wind in D Minor, Op. 44: I. Moderato, quasi marcia
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 0x4b243979a11c51fef8440d712295f935c5f1227264edb4df321b1da3a835ed51. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960100246.
Serenade for Wind in D Minor, Op. 44: II. Minuetto (Tempo di minuetto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeea3ea4a620b7e89bd46608ecf55032f58f49d8010a2b94da597b59a528366f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960100247.
Serenade for Wind in D Minor, Op. 44: III. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e27ec5ec0baa8d3eed9045b66d74743e8a3728ff62b7b4c2f1b4ed4533d5bc. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960100248.
Serenade for Wind in D Minor, Op. 44: IV. Finale (Allegro molto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e067e0d648558031b80beeda2581825b64cb0778635629ba48f7322f5d8743. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960100249.
La clemenza di Tito, K. 621 / Act 1: "Parto, ma tu ben mio"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce007c44b26dd48b5e4fe45f0b11ad12d1a79426b2983c1267a46f589defb08. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078943108.
La clemenza di Tito, K. 621 / Act 2: "Ecco il punto, oh Vitellia" - "Non più di fiori"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb87ba12b97b5b1ea9a8448e3c617d579ece7173bf5c69d52f5ce35a3a234745. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078943110.
Clarinet Concerto in A Major, K. 622: III. Rondo. Allegro - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ed32695b62a3cd4c51fd3607cc8e74d1132950366af9d66c7217feca821ecc. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058704422.
Piano Trio in B-Flat Major, Op. 11 "Gassenhauer": II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c31ce856ed1d1fdfd390ad2a414939579bfcfe1f1979691b7c39d708b40939. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190301102.
Sinfonia concertante in E-Flat Major, K. 297b: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde6b61a66949940264c56098e8c453065202fa036bf7a780ef6825e27a99b9c1. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057501202.
Sinfonia concertante in E-Flat Major, K. 297b: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5118476d521aa8ddb6d815691edac1d007674c3ce2fe1867e3fc04ba011499b. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057501203.
Sinfonia concertante in E-Flat Major, K. 297b: III. Andantino con variazione
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0efeb0e5020ac136d51f3349408d59efa82e2a8089677ce715ae79b3fc03f8f6. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057501201.
Morning, Noon and Night in Vienna: Overture
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c2cd48d4892736fb77567b93a69b184cebcfa18a102b0993a92f12ec2bdaa0. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059903410.
Clarinet Concerto in A Major, K. 622: II. Adagio - Live
Mozart: Symphonies; Mass K.427; Requiem K.626
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a31b67576ba4ed7c6adbb40fb19084f93eb2139e0e1071b33e00426a1874c9a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058704421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ed32695b62a3cd4c51fd3607cc8e74d1132950366af9d66c7217feca821ecc. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058704422.