thumb|In the folk story, a pot that initially contains only a stone has other ingredients added to it. "Stone Soup" is a European folk story in which hungry strangers convince the people of a town to
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8fd89b20038ce7bf1a49616eba335d8c12646484515f05dbf5b9ddc62ad46c2. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c040aa9f-4c90-4c70-9fe5-4468f6e2b6fd.json and https://artists.proofprofile.net/proofs/artist/c040aa9f-4c90-4c70-9fe5-4468f6e2b6fd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).