Butterberg is the name of several mountains and hills: in Germany: Butterberg (Bad Harzburg) (308 m), in the Harz, near Bad Harzburg, Goslar district, Lower Saxony Butterberg (Ilfeld) (539 m), in
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 0x76ff9bd2b3f7b404dc32f036bfedb28dcf026bfa9fad64a9096618fa46bd3b9b. Chain 2 (Bitcoin): anchored in block 954689 (2026-06-21T10:35:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e2637b90-7a82-4be1-9bf8-bb9bada19994.json and https://artists.proofprofile.net/proofs/artist/e2637b90-7a82-4be1-9bf8-bb9bada19994.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).