Ika may refer to: Ika, Akwa Ibom, a Local Government Area in Nigeria Ika, Croatia, a town in Primorje-Gorski Kotar County, Croatia Ika language (Colombia), also known as Arhuaco Ika language (Nigeria
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 0xf39726eb00f65cf2bb7e3d23e76df3dcade5f1b91974b912784bfa3fdf23d218. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8e897acc-73d7-48f6-ae47-dd3c2409da38.json and https://artists.proofprofile.net/proofs/artist/8e897acc-73d7-48f6-ae47-dd3c2409da38.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).