Ondřej Soukup (born 2 May 1951) is a Czech musician and composer. He has written soundtracks for over twenty feature films, including Jan Svěrák's Kolya, an Academy Award-winner for best foreign film
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 0x2335b3e9e4f6e657b07d071d84ec102843dd0cba99c7196d293d6d63efa608cd. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a556e970-5e92-400c-b008-7b4f0aba18f7.json and https://artists.proofprofile.net/proofs/artist/a556e970-5e92-400c-b008-7b4f0aba18f7.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 0xf7b1ad6053c057a23eabf686bd66e87274a65939553f108fa48d4496bc30529f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CZD711100030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44da91422491df173501859256d426c0230c6f9ec2862f977d27523c5f273eef. 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/USHM21842221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6edc3c02515d4c17637f7d00032f39b027b8349e95b2e96871694dce68368d58. 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/USHM21842222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d05ac9d0a1a954ff76a22db5635e123a31691ed3bea20ea26a299a84c31196a. 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/USHM21842223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89490c6d1cc09a0dbed19b038063147a53c1eebaa4172c5f4e4f41dfb8c08eac. 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/USHM21842228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2bc7b91ce44a93fe2118be4f49b0fc29c3194e106cc9d9b574a840172903dc. 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/USHM21842241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556cb0a2d171ad58d4acdf75abc976ca1fcdb1a344fc5ac176ec5e23afcd6c6c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USHM21842244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea261da0ad48e42f1b8487885d705efd12585bf5f0a873cd520017f7048a53b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USHM21842225.
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 0x2ca9f9aac435e55926aa00a9b1a17d959b098af43d616b13eeaded321e52ece6. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USHM21842227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9df19f279ede471a9e1ad2d23f539e95b25fc94663134e3a318f162e5fd1c544. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USHM21842229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f4d28ed5df6e236d7ef9ed6b004635187d1c8abbcea6cd93d6d7e967446c125. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/USHM21842231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc0fbc95148e645fa0528e14cc187af3164e27a55ec7e9596746b9cffeeb619. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USHM21842232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x017adaab24b98b56126a92d11b7b421dba9574fb22520c670ccb8eed6ad228ec. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USHM21842233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc32a453226085d2d88da8cc28bc3932d43b203515a234e02803bdd9d402813a8. 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/USHM21842234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62914a6d7c70d4fa875db858ff88f6daaf00a7b7038dfd9c8efb6a27f9a9a0f0. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM21842235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a19ad4e69adf8bc185100c3ee9fb0d5f1954310743fca82585dd7e7b9b194e. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USHM21842236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1449ec6a6146ed1da6eb8cbb4f91228ee877c404d78453fad2a0d1265934b43d. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/USHM21842237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x140c14ada628d1c8ef3186292f6f890161ef1a17f8cfef226037ce2108767e41. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USHM21842238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f226daa1af7143b54d541c1814ac73e0ab90278654feb3b30922ba224dfde3. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USHM21842239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b8b09d1bb5d6b01ee16a16aecf5e902c949fff2a826dfbf67dd32f587be7e97. 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/USHM81892471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a2399482fd2560188ec64edb3e8df82782d73d3cafaed3a7d05b2dde30c7c2. 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/CZD711100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7b1ad6053c057a23eabf686bd66e87274a65939553f108fa48d4496bc30529f. 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/CZD711100030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aacd9093624211e8545b1162719b7fdd3454f678394d7c69b3462cf32304214. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CZD711100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1ed0579f9f1b2b500ffb5414f0c05c447c5a54c739d03c0fe37393f220081a6. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA231100208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d3366a7d2565c89dbf8ca58ed1ddf128458b9e32adf2145b858296fbd31e58d. 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/CZD711100033.
Prague in the Time of Plague 2020 (feat. Lucie Bílá, Michael Kocáb, Kühn Mixed Choir)