Marden may refer to: Places Australia Marden, South Australia, a suburb of Adelaide England Marden, Herefordshire Marden, Kent Marden Airfield Marden railway station Marden, Tyne and Wear Mar
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 0xf1483efc6c5f6c739bfd6c33b14ab171a71e86668ea43e7797cdd4bdbc9d60a9. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/67208b45-e004-4c2f-a2b5-f4b1a779d18f.json and https://artists.proofprofile.net/proofs/artist/67208b45-e004-4c2f-a2b5-f4b1a779d18f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).