Kreyson is a Czech metal band founded in Prague in 1989 by Ladislav Křížek (Vitacit, Citron, Damiens) after leaving the band Citron. He was joined by Jaroslav Bartoň, also from Citron, Daniel Krob (Ar
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 0x19a4f66fd1032eb7f5f14870acff3e3f6fc2799974492ebe3a832ea008c5d91e. 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/116b7fb0-d3b7-4ba8-b33a-e463cc3f8002.json and https://artists.proofprofile.net/proofs/artist/116b7fb0-d3b7-4ba8-b33a-e463cc3f8002.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 0x064e36c629e30d387272018e763ce29f28081118a4ef7d9f09463e3736446003. 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/FRX201743289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae164adfe1ac9ed549ec5ba55ae8a1987cf5e717bea726c998d7b3f8fa21682d. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/FRX201743290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86e98ccf62085dfd6d0a4d4014720e0592e4ea9522b5c7ba912b959836a59ef8. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/FRX201743291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x210dcb069ddb70abb176b66e7b50496a91f92e4362e582edaf36a61684037b76. 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/FRX201743293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x002dc46c63fd2e547d55038f5dc48c12d39db39f6a251122473c3d09f194ebdd. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FRX201743295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e4ca996c8a3ea0c1bd0dc620ec4c22889825c9d3f85cf0430e5acf57e08c8b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FRX201743299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8bfa46967eb5bf08ca162ea6831835b46a678202942ead33d593834eb32d9a1. 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/CZI361300155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecfc761b2faabc0b5fcc69823027ef958f29e4dbb0347255773529d8ff5eafe9. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/CZI361300156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b767b129b659aff632e5cb4c4c8097be1748e1165b635ff0518f7b63458256. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CZI361300157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba2143baf545723e44e09f6c72a15bf1255b871aad863d1bf0da8745feedf32. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/CZI361300158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb38a753f679dca5a1529ed61f88d786410ec1c3cdcaf4449c87d50d6373ba931. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/CZI361300160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5035a376891292cf05e64e202d2e0e2fd29330f7601b80df74d7154e0725bc2. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/CZI361300161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d23ef539c49829157b997687ce3381f6750b4665dbff597877723634ae9033. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/FRX451573178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x862be6e9a99fe97e25814594832bfb1749a3400d23513d2d942a5d912732594e. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/FRX451573181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78b2ef1c99dbcbddefc20a9a3423fcac493447e2aa86fab54e53912ac8b5e6c. 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/FRX451573182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978b1fec0ea2574b4d3d9dd82a0b773acb199e88cedf30910c91dd1131d7271b. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/FRX451573184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5db04a4338a45c856b24e53c99044362806735ef1d44715832b40216152efe8d. 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/FRX201717040.