Erith () is an area in south-east London, England, east of Charing Cross. Before the creation of Greater London in 1965, it was in the historical county of Kent. Since 1965, it has formed part of the
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 0x9470f5d409f45a7597b63c46ae464457365082e0546ae97f1369402513a038c0. Chain 2 (Bitcoin): anchored in block 953922 (2026-06-16T09:36:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1bf8bdbb-4167-4658-94a4-8d59315ba176.json and https://artists.proofprofile.net/proofs/artist/1bf8bdbb-4167-4658-94a4-8d59315ba176.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).