Ju or JU may refer to: Names and people Ju (Korean surname) Ju (Korean given name) Jū (鞠), Chinese surname Ru (surname), romanized Ju in Wade–Giles Ji Ju, a semi-legendary ancestor of the Zhou d
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 0xe290711f719fc5151446e96cabef9a686bf89024e169a8f6be37b3e1b0f79e8e. Chain 2 (Bitcoin): anchored in block 954010 (2026-06-16T21:41:36Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/340cec3c-745a-4c5a-b230-7cc30f09d4ad.json and https://artists.proofprofile.net/proofs/artist/340cec3c-745a-4c5a-b230-7cc30f09d4ad.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).