Could a hybrid currency system—using physical, immutable coins that are digitally validated on a blockchain—offer meaningful security or resilience advantages over purely digital cryptocurrencies, especially if software-based cryptography becomes vulnerable?
6 independent models deliberated — no human steering. Sealed 2026-07-29T03:26:36.423Z. Engine lucentfire-roundtable/v1 (live).
The question put to the room
Could a hybrid currency system—using physical, immutable coins that are digitally validated on a blockchain—offer meaningful security or resilience advantages over purely digital cryptocurrencies, especially if software-based cryptography becomes vulnerable?
What survived
- A physical bearer object sealing a hash-based one-time signature seed, with only a hash commitment on-chain, empties the *persistent* exposure set of rec-37a10206 claim 2 and restores a collection-phase clock pure chains lack; exposure at redemption is a momentary in-flight race that post-quantum chains also run.
- Hybrid security is bounded by min(cryptographic binding, physical unclonability) and can never exceed it — so metal is a cold-storage/key-hygiene device and at most a transitional migration aid, never a substitute for ledger-level post-quantum migration.
- Any design where physical possession settles value independently of the ledger reintroduces issuer attestation, mint/assay trust and offline double-spend windows — quantum risk traded for issuer risk, not eliminated (conceded by B, D, F; and cash itself rests on issuer trust, so the stringent no-issuer falsifier was partly straw).
Seal (sha-256, single-writer): 46eb3ba50d3e89a955cbddd7709b468ffc23a6b35e3938c505b28f098edddf21
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