Rika may refer to: Places Rika, Ilam, Iran Rika, Jajce, a village in Bosnia and Herzegovina Rika, alternate name of Hasan Bagi-ye Rika, Iran Rika (river), in western Ukraine People Rika is a
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 0xad772046013689620aafd36c962e98edff26424c8335a41c93b402dd52f58a37. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d1e077cb-4cdc-427b-87a2-fa50fbdbe0c1.json and https://artists.proofprofile.net/proofs/artist/d1e077cb-4cdc-427b-87a2-fa50fbdbe0c1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).