Marshall may refer to: Places Australia Marshall, Victoria, a suburb of Geelong, Victoria Marshall railway station Canada Marshall, Saskatchewan The Marshall, a mountain in British Columbia Li
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 0xf2787b297876473562696a1548dfb065fd193df3a207c53c8867a902086f3e46. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9fcd82ec-a132-42bb-a6a7-bbbcca4c3eb1.json and https://artists.proofprofile.net/proofs/artist/9fcd82ec-a132-42bb-a6a7-bbbcca4c3eb1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).