In German folklore, a drude (, , pl. DrudenManfred Lurker. A Dictionary of Gods and Goddesses, Devils and Demons, Routledge, 1987, 53) is a kind of malevolent nocturnal spirit (an alp, kobold or hag)
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 0x8572c0aa085ad2756e2f8d7e2e4d19cbc805394522a0cb1e74979ac8c6096bd1. Chain 2 (Bitcoin): anchored in block 953889 (2026-06-16T04:57:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0dc9d1f9-cd10-4e54-a83d-0cb501ec1a75.json and https://artists.proofprofile.net/proofs/artist/0dc9d1f9-cd10-4e54-a83d-0cb501ec1a75.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).