Guri (; ) is a city in Gyeonggi Province, South Korea. It is located immediately to the east of Seoul, in the heart of the Capital Metropolitan Area. The Royal Tombs of the Joseon Dynasty are located
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 0x2cc3dd8827f2dd14e9e5be5f800586fc8eee18ae06d2b44aa287a3b807bae489. Chain 2 (Bitcoin): anchored in block 953695 (2026-06-14T21:42:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/72187f86-6139-4dd1-afa1-75da061bf8bf.json and https://artists.proofprofile.net/proofs/artist/72187f86-6139-4dd1-afa1-75da061bf8bf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).