Ludmila Peterková (born 16 September 1967 in Karlovy Vary, Czech Republic) is a Czech clarinetist. From the age of 7 she started to play the recorder, but later switched to clarinet. From 1983 to 198
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 0x2635c3c7158544e4c1c2af06f422b2e37cbdee18c0f0f1a8607cdfb84c32c0b0. 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/28b7d564-0b6b-4e98-a258-9ae3de37d84e.json and https://artists.proofprofile.net/proofs/artist/28b7d564-0b6b-4e98-a258-9ae3de37d84e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bruch / Mozart: Trios for Clarinet, Viola and Piano
Scaramouche and Other Concertos for Wind Instruments
Bartok / Khachaturian / Milhaud / Stravinsky: Clarinet Trios
Bartók, Khachaturian, Milhaud, Stravinsky: Clarinet Trios
Suite for Violin, Clarinet and Piano, Op. 157b: II. Divertissement. Animé
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 0xb0a9759957c8b0078f124821f2c8de071147936394f1601c31f4276faf539a1e. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA160002140.
Mendelssohn, Rossini and Bruch: Works for Clarinet and Orchestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f3e8b8977f47fb708a6997e93ee05b864fb060fee9760bc5cd07a54d4d83942. 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/CZA160100133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50fbff0b5cb0d1e7e7ba9092f049aaf561c77e7cb86340e33d7baf7528263f72. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CZA160701484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6094160090a0756dff25bae2d368395c4972bbed46f311a84d689f78824ce806. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA160701483.
The Tale of Tsar Saltan: The Flight of the Bumble-bee
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ca028217dfea4e30962355afbe6b9a63724365687fb7413725560df90bbe12. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CZA160701485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f7afb478245d9cfa0b02fff2a58ef75653234a124696e982380b115ca51c71e. 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/CZA160701491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1f8faa1a1abfc1dcb392b34941e72dfc756427e562ea436f8e21e6a2329316. 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/CZA160701482.
Hungarian Dances, WoO 1: No. 2 in D Minor, Allegro non assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25515386046730104611631279a720dcf350276fd7b82affb343e903d837626f. 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/CZA160701500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf31cfd69574d7032ce5f4f401d62913810d5b2e202b7215eb181e8db86bcf11b. 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/CZA160701489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc936eb5d0c099402a3af926b6aa6ef95f438c55472f2b96f98738ed7920955. 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/CZA160701495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9595891b426b91d0b363557192bade255008868391fe7f40dae8fd225585ce. 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/CZA160701481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x210afae4ac37c9e7822de253b15eca7583460ce66edc7171b5d5c5ef5f02a943. 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/CZA160701492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a43f6888272080d9e7c41d1648afdec84a12f84dc7b9253169758c6ec4936a4. 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/CZA160701494.
Schwanengesang, D. 957: No. 4 in D Minor, Ständchen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815873b3c888de9ed6e68b97bcf5539b4420e35220d54b982fb39d8710fd5dd9. 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/CZA160701502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x007ca8de2f61ed6954f34e8e6fb2b0797c61f94bee16b5026292b1d0d3f42c0e. 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/CZA160701486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc35855ec335131cd2677cb6b35f37a0b124f38e5ec0ac7e8fe16f55cb4917388. 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/CZA160701487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a811c17dde8ca07b29b38c438f0e3be7e5049eac7e6f58e9e9ce74b121c4f89. 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/CZA160701479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b35efe98232e9a6cfbdbdc0571f5a43df5736f6a482079042f81de6421d14c. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-21T17:20:55Z), 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/CZA160701478.
2 Mélodies, Op. 3: No. 1 in F Major, Moderato assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed097fd150f98b49a96f0042cd43b3fa0342bfc63d44d157a55d04ca7f9834dc. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA160701501.
Mozart, Rejcha and Kukal: Clarinet Quintets