Artur Marcin Rojek (born 6 May 1972) is the former guitarist and lead singer of the Polish alternative rock group Myslovitz. He and the lead guitarist Wojciech Powaga founded the Mysłowice-based gro
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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 0xd6012cca4bf17ba5d031c588b41c211022273ef6c00762aa1f22c08ddff0ffcc. 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/7bc86d35-2aab-4e48-a4b3-042760660745.json and https://artists.proofprofile.net/proofs/artist/7bc86d35-2aab-4e48-a4b3-042760660745.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 → block OTSBitcoinBlock must exist at that height 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 0x152027b88e525c692919ad7195c64857ff0311d669c9fcdfd9eaa105d6370bc7. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PLA811400030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb628bf30dcf10e0da61f3514828a31e2f4a7bf17fae9fd4239f6ecb91e0cdf. 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/PLW911700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a962f7fb5389139d6179951aa3908df963a4b6f58c54ebcbe7d9a67f6081a41. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:27:16Z), 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/PLW911700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10e5522dc7522e5d3674a3fbd6a9fb99cc1b6b25399d65568e98df2c50bc7219. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T23:49:40Z), 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/PLW911700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc369653b7481787f80c0d900ddcf07bed42eab6bd88e041b1d9d4fb8b4e30b7e. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/PLW911700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54cf190b3eb48328788b703ba5b0c2afd76b5ca166628ec3a330923a076d0071. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/PLW911700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2dbabee0908bc74a92291ecff43c6ddcc06a32b68e72c03801c30595f821dd5. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/PLW911700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd40e9f77e4fcf68b6de9be7b322d90ea6e20cbc3582d1937a860330cb72a7c02. 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/PLW911700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86899f8693b59f4f16aef117e2c61345b948ddebb16f778b0f0807c40664f346. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PLW911700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b7aff70cbdbefe57da4f21dd00bfb0a13fe7ebc4dff4aa9332f0e48859de17. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:01:01Z), 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/PLW911700011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x656da92a7a3d2a3dc6268f2c9435f7959b839514f73401a959a2c8f5d5c7e779. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T11:31:28Z), 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/PLW911700013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6481da6eabe6dd12b15698c06a4177fe03e8792f41d4076ac8f8afaba56d6a5c. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/PLW911700014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9196620a9005f7263f982eb6b24b501612da5e64d5faf3e2eb8b2538d0c687b. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/PLW911900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac4ee7812f76ae1a2ad36ee4b5661bd201fdf6b27ede2461433461cfdd65a671. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/PLW912000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2c8244d41f2b85dcb99300a4e180f6ce7732d8414447695ab5a42eccef8ee06. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/PLW912000011.
A miało być jak we śnie (feat. Taco Hemingway)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0afa0ae167081151556438815d88b1bdbd938e168b8f23474f7508f0627cbcbc. 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/PLB822400214.