thumb|Carl Stamitz Carl Philipp Stamitz (; born in Mannheim and baptized 8 May 17459 November 1801), was a German composer of partial Czech ancestry. He was the most prominent representative of the se
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 0x0e2b9962aa923892683028acbca1689b03e1dc9653994421c1013892a93fe89b. 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/5e9c2742-501a-4c1d-9aa5-2defb17a032d.json and https://artists.proofprofile.net/proofs/artist/5e9c2742-501a-4c1d-9aa5-2defb17a032d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Stamitz: Clarinet Concertos Nos. 1, 7, 8 & 11
Stamitz: Clarinet Concertos & Double Concertos
The Concerto in Europe: Paisiello, Grétry, Stamitz & Garth
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 0x5988f64c541e60233699bbe69b2c1971e1e078bdb686cd689097c387b3c36832. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBAJY8801504 — a six-check JSON result.
Flute Concerto in C Major: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf343c8c9d1534e9b0175139f9626d3451617cd4623538e53624a29d7c95a216e. 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/GBAJY8801505 — a six-check JSON result.
Stamitz, C.: Duos for Violin and Viola, Vol. 2
Divertimento in A Major, Op. 34, No. 1: I. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc0cb54aa45fb336f7ae78133d891a715441853c38d53aded8c5174aa28af17. 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/HUA253245307 — a six-check JSON result.
Divertimento in D Major, Op. 34, No. 3: I. Poco allegrino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7e03ac3378a1efa760247917cfe75fe331aded06ceaca2aa90fc7e0a2b0a371. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/HUA253245311 — a six-check JSON result.
Divertimento in C Major, Op. 34, No. 4: II. Rondo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170da2db1825175d550fbfbee9c681677a7b4e65233868b03d407244a3cc19d7. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/HUA253245314 — a six-check JSON result.
Divertimento in G Major, Op. 34, No. 6: I. Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x256d951b23b5991a5528eec1b99ffdbb2adfa717f10ea456c25f79272389b618. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA253245317 — a six-check JSON result.
Stamitz, C.: Duos for Violin and Viola, Vol. 1
Duo in C Major, Op. 19, No. 1: I. Maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93dda8a86945290fad600256c968eb76eaa79111900a598a53b70e6fe01ecbb. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/HUA253228203 — a six-check JSON result.
Duo in C Major, Op. 19, No. 1: II. Minuetto grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4269abda9be6289943c32d565bfbeec7eafea4db82c63040d38f5530858421a. 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/HUA253228204 — a six-check JSON result.
Duo in D Major, Op. 19, No. 2: I. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92069687566fed17617ba0ef71d6f82b42d489f969d888171515ce6d74ba9a5a. 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/HUA253228206 — a six-check JSON result.
Cello Concerto No. 1 in G Major: II. Romance: Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x040c25707d788f9f9239db13da86c08e118663c50888188354db3c6f36f0df3d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI199312202 — a six-check JSON result.
Stamitz: Oboe Quartet in E-Flat Major, Op. 8 No. 4: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x113a6233c4e39b15c8426ed52fc87d6036b464935765aff465261aee3be9c580. 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/GBAYC1501576 — a six-check JSON result.
Stamitz: Oboe Quartet in E-Flat Major, Op. 8 No. 4: III. Rondo. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d21acd0cd1fe418ac19875af617307aa4710195b7a504fa6e06b61877a20669. 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/GBAYC1501578 — a six-check JSON result.