Ondřej Havelka (born 10 October 1954) is a Czech jazz and swing singer, actor, and director. He began his musical career singing with the jazz band Original Prague Syncopated Orchestra in 1976 and wen
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb631ed72fcead9a2a18d88fc68a11cc1736e0db6868a080088f87ae141c88a2. 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/096c4f39-d484-4709-bfba-0b7c2c8e46ac.json and https://artists.proofprofile.net/proofs/artist/096c4f39-d484-4709-bfba-0b7c2c8e46ac.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ff2a4856911d5c4bc7bf4aa9675c78635a4326fd06e3cddb8fa3ff71679cea. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/CZA168800645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd197c9aa815b8706c3a0286f2a56731cd5c35dd0ba57d5b778782a2351cde0d. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/CZA168800648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdb0a7f2f6866e9d0549b4534422d81f6d30e61353c4190d46449b22f972d209. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/CZA239500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a2d9e2d6c073961ef4a60176a66912d0b5c0eb961d59f74413e27385f052d03. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CZA239500026.
Nejlepsi kusy z repertoaru (To nejlepsi z repertoaru)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9792d9c85f989fa23a7fbf4b8ae089ea3003ca384140470507d01faf9c9b3b8d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CZA239900623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0458cfaf488377a5cda7f4f03d0356c05acf13b2b3255ad678a2a7e9aefaf6f9. Chain 2 (Bitcoin): anchored in block 957919 (2026-07-13T23:58:45Z), 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/CZA239900605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e906089ddbe669f01c7615ea99fe0be1e5b6f2352c298373c362a43ce80a6d. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA239900608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc19787aeb817ed06f22be44b477e2fadf3016aa78d125bbefa277c360c2e4ae2. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/CZH810200034.
Legendární gramofonové snímky z let 1976-89
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x787592d8978e19e62a32b78d540a50f0c3345ca0080cc7d990678494c86afe3e. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/CZA168000759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6388a9fd08ddbf7239c13bc526dcc3d422b8a4305dd822dd43b050d8c048e3cf. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CZA168484996.