thumb|270px|Zamachowski's star on the Łódź Walk of Fame Zbigniew Zamachowski (; born 17 July 1961) is a Polish actor. He is a two-time recipient of the Polish Academy Award for Best Actor. Life and c
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 0xeb38a0874c1c2f2a7f50d6f36304e84f54aa84ffd09228a9aafae9925911b049. 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/039b6f99-68ad-4511-835a-3f6d6c08c9ae.json and https://artists.proofprofile.net/proofs/artist/039b6f99-68ad-4511-835a-3f6d6c08c9ae.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Fryderyk Chopin-Listy: Fryderyk Chopin do Dominika Dziewanowskiego w Berlinie (Paryż, styczeń 1833)
Fryderyk Chopin-Listy: Fryderyk Chopin do Józefa Elsnera w Warszawie (Wiedeń, 26 stycznia 1831)
Fryderyk Chopin-Listy: Fryderyk Chopin do Józefa Nowakowskiego w Warszawie (Paryż, 15 kwietnia 1832)
Fryderyk Chopin-Listy: Fryderyk Chopin do Jana Białobłockiego w Sokołowie (Żelazowa Wola, 24 grudnia 1825)
Fryderyk Chopin-Listy: Fryderyk Chopin do Antoniego Barcińskiego w Warszawie (Paryż, 14 marca 1836)
Fryderyk Chopin-Listy: Fryderyk Chopin do Tytusa Woyciechowskiego w Poturzynie (Warszawa, 21 sierpnia 1830)
Fryderyk Chopin-Listy: Fryderyk Chopin do Rodziców w Warszawie (Szafarnia, 26 sierpnia 1825)
Fryderyk Chopin-Listy: Fryderyk Chopin do Juliana Fontany w Paryżu (Palma, 15 listopada 1838)
Fryderyk Chopin-Listy: Fryderyk Chopin do Rodziny w Warszawie (Szafarnia, 24 sierpnia 1824)
Fryderyk Chopin-Listy: Fryderyk Chopin do Rodziny w Warszawie (Szafarnia, 19 sierpnia 1824)
Fryderyk Chopin-Listy: Fryderyk Chopin do Jana Białobłockiego (Warszawa, listopad 1825)
Fryderyk Chopin-Listy: Fryderyk Chopin do Rodziny w Warszawie (Drezno, 14 listopada 1830)
Fryderyk Chopin-Listy: Fryderyk Chopin do Prezesa Towarzystwa Polsko-Literackiego w Paryżu (Paryż, 16 stycznia 1833)
Fryderyk Chopin-Listy: Fryderyk Chopin do Rodziny w Warszawie (Wiedeń, 12 sierpnia 1829)
Fryderyk Chopin-Listy: Fryderyk Chopin do Jana Matuszyńskiego w Warszawie (Wiedeń, 26 grudnia 1830)
Wojciech Młynarski Zaśpiewany (Dobre Piosenki)
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 0xcd2e7cb995e027f07686396a6de3907049a6acd78007edab82a3d2d5cf99ee5c. 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/PLB171500256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf711424ace1191a07bcd983cef6d6755e8810d533ce0eaeab2acc158fa05655. 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/PLB171302698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a365005dc15d497479f7f09d5544832b6c954ae5b1b3f5c738ec08179e9c6e4. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/PLB171302714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf82a5c9b9c24f19f34881c86e6768c7f82274b416f4ac2dfd989eae25e291be9. 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/PLC592400033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e7f0a011dd9e4707a7232b74ca0f95faae2537b61e3396a96cadca44206d32. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PLB171600261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e7f0a011dd9e4707a7232b74ca0f95faae2537b61e3396a96cadca44206d32. 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/PLB171600261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe8bb3008217b463db58a2249d0df269eb0ccc25c75c7528cf2e2edddee6f3f. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/PLB171500250.
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 0xd5519a341a375e300c252ff9dbc2022b9247816ddbd5bd7255df67aa5bb73be1. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/PLF781800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b9b9463bd4d4847a44080920024362bf5f8992a040965fd572cdeb2a877f0f7. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/PLF781800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1295563044c59fa71637f3b15c83e3424f595b4f6ffba6785e9cba1cb2e2fa81. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLF781800016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e7f68aed8667bb07aaef72a71532e0b0474d86002b16728f4f1439174a5487. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/PLB170701768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc10813dda670fc254bb3f03b349beab9ac36b98127b2dc32d443b88631b70880. 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/PLB821900114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f5cc981e81bd0486479a38f964e0a9d1916d4d856e04643816f6d58ff8808e9. 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/PLA391500404.
Niedziela na Głównym - Piosenki Wojciecha Młynarskiego (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa452472b4826a7dbc9ad335cf2d5f88279215c2ae669339553af641b818d350c. 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/PLA291100104.