Grzegorz Zbigniew Ciechowski (29 August 1957 – 22 December 2001) was a Polish rock musician and film music composer. Ciechowski was born in Tczew. He was the founder and frontman of the band Republik
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 0xca6f3d8f406235f5231e6210beb504c808f077cf04dbd756aa51e818932c1c09. 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/c25cd5ec-8e5d-45bb-8495-08070cdc9ee6.json and https://artists.proofprofile.net/proofs/artist/c25cd5ec-8e5d-45bb-8495-08070cdc9ee6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Wiedźmin (Muzyka do filmu Marka Brodzkiego)
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 0x4207d9218a3f50b96ceb6be6944eed4bcc07987fff771a2acfc018281e127efe. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/PLA550100419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1fca8d41c1f1ca7537c788e2d87b9e6b61111081940618a568839b40f08dc0a. 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/PLA550100420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeedf92d0c852ab58976423852ad04d1e025ad279a3cd55401b61ea71e300d8bf. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/PLA550100421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc8f628122107440ef1a020d85863f29b3ef1fcfaf3a1fdf996b367dda08808. 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/PLA550100422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b5f5939def12d1df68f857454080b20d970fb599a01818c1189ee7237765493. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/PLA550100426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b5e522da254c846ef174645d062bd9fba434f45346b51fe4c7b7a26caaf97ed. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/PLA550100429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0880d78d356fe3bce76de354893ceff095f5dd23c71b72158f43358c0a08a89a. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/PLA550100431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86bb6f7f8b6df6be5e5d15bd5d3b8b6deaed779c18bf096ab6c1a106571e98df. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/PLA550100434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aae238281eb32129ee18fea455acc486bb96c3073776fada34d7435bbc99e64. 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/PLA550100438.
Orchestral tribute to Grzegorz Ciechowski
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44e1913e3f8e7532fb542130b2064b433eadd8bd7ddf9c1c669b3bcaeaccb58. 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/PLS282000107.