class=skin-invert-image|thumb|200px|right|2,5-Dimethoxyamphetamine (2,5-DMA), the base chemical structure of the DOx family. 4-Substituted-2,5-dimethoxyamphetamines (DOx) is a chemical class of subst
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 0x591c275036d94f62a8dee2900863b7beca379412a6a7af9022a4f6505c52893c. Chain 2 (Bitcoin): anchored in block 954013 (2026-06-16T22:27:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/34517082-b871-454a-b68f-f7364864d9aa.json and https://artists.proofprofile.net/proofs/artist/34517082-b871-454a-b68f-f7364864d9aa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).