Kopa or KOPA may refer to: Places Kopa, Estonia, village in Hiiu Parish, Hiiu County, Estonia Kopa, Iran, village in Gilan Province, Iran Lake Kopa, lake in Akmola Province, Kazakhstan Radio and tel
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 0xe9872b0f6fc193ad1dad9fe8b9bccc6ebad80a11fa062bda5e551abbe1e9828b. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/49046d60-c9ef-4fb8-8f66-1eacf5f894d8.json and https://artists.proofprofile.net/proofs/artist/49046d60-c9ef-4fb8-8f66-1eacf5f894d8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).