Kasta () is a Russian rap group from Rostov-on-Don, formed on November 20, 1999 from three members of the group Psycholyric: Vlady, Shym and Hamil. In 2006, Zmey joined the group. The group works in t
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 0x97d7b25c4d9e92506e505b9e9d1010d7e86f42df1e7e2d8e2d1b6978b463e255. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f623c93-1f26-4b92-abe7-4d6eb31019c3.json and https://artists.proofprofile.net/proofs/artist/4f623c93-1f26-4b92-abe7-4d6eb31019c3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).