Paul Walden (; ; ; 26 July 1863 – 22 January 1957) was a Latvian-Baltic German chemist known for his work in stereochemistry and history of chemistry. In particular, he discovered Walden's rule,Paul W
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 0xf625a9a9dc621afa9577b806f4cd4547401c9b8b9a146f66896e573159d989b8. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/87ccac2f-2579-426d-800c-9bbcda6fd011.json and https://artists.proofprofile.net/proofs/artist/87ccac2f-2579-426d-800c-9bbcda6fd011.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).