Jasná Páka is a Czech rock band formed in 1981 by Michal Ambrož and Vladimír "Dáda" Albrecht. The group was banned in 1984, and most of its members subsequently founded the group Hudba Praha. In 2008,
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 0xfb8ac274740eab00e5f3334dddbd8659a448dcdd5c9135d746ff3148de17109f. Chain 2 (Bitcoin): anchored in block 953819 (2026-06-15T18:31:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fda0cb81-e1f2-47e1-8ac9-53f3a54d97e6.json and https://artists.proofprofile.net/proofs/artist/fda0cb81-e1f2-47e1-8ac9-53f3a54d97e6.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 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 0x775dfd2bd0a8163ad14e6b8a26963d39afedf3fd4daf90c8c5b659bd2b67eb45. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/CZF010900104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c9d5d7ca1ef0e50d9f5dfaa115697211f2be806695738825f60cf4db45885e2. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/CZF011000030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ffd32f99a332414eeff5a0b85d079d68896037a9a7491bd4c13e8be28eded4b. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CZA230700127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295815f2dcea9af44de4d69aef8a7ac48e82bc45db24f7dd9ba701f645eeef1d. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/CZA230700115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995fa9e0f78358616c77de4dbddb9fe2a69b54e443edcf4f9f89a6b3aa2cb0dc. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/CZA230700116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1440a1ca1d385f1e3ac2adb410cb13760c42ba7ed4256fc73e2d559f14b909f. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/CZA230700129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d8fbabfce055ff2b0d07c4d361a6106892e8120d5a1249de1f5cd239a8efe2f. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/CZA230700132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eb0be9ea3316dee43fe76897ed56f426d7c3ba42aa27fb6d88174194dff3410. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/CZA230700121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08bdcef473d6bd5e3c651b455bd8e9e39c32210a1c9421770bcb1725630efcee. 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/CZA230700133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x377f5aaa05318d9f187d0345f9a33bf6b6a54aa9038e7a4b85f1792cc0ce0889. 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/CZA230700124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6590aa34485d147ab46b6375d2e437bd467eeba8edff11c602e44a1bc712d14c. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CZA230700125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf61d5d3cc7ff94ef762bd9896a30f432efdec343912dc0a472ab5f3de54ddb. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/CZF011420001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd6a7c2d7c0000953052ea7cbe27c7469faa61d4e09546ef8be111b886f9e9f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CZF011420002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb28e13f29b3bf70ee01f7d6c6caa75c5fa3717979791057508b82539e5faa43a. 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/CZF011420004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f6e7e4eb7ad88ff433b6dd1d018ca0b3b2e40e6cd049bd5b1fd2e844e1c7793. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZF011420005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd742adc315c16260679aa203bc2084bea55c42dcd2fc3ade34df3049af9fc603. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/CZF011420006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61ba0bca47dfd74247d3cf5fd3f12e651807e1613190a68985164c63683ac4e. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/CZF011420007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6b14bad98a26802b1229ffc135002ae54d2dda7fb81f53e454950a3cfb366d. Chain 2 (Bitcoin): anchored in block 958399 (2026-07-17T10:39:51Z), 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/CZF011420008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212989455adbf60ea2ffbe9e335c32541380c65b50892d640d2704f2e41ea23a. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/CZF012200050.