Sommer is a surname, from the German, Anglo-Saxon and Scandinavian languages word for the season "summer". Notable people with this name include: A–L Alfred Sommer (born 1943), American academic A
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 0x3b25c77a6c87166d6387af04662b54d183a4ea857443b5ba1c2a00a2743db6cb. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b23a76e3-066d-4f8f-aa57-fc922f6a8d67.json and https://artists.proofprofile.net/proofs/artist/b23a76e3-066d-4f8f-aa57-fc922f6a8d67.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).