[Cryptography] Quillon Graph: A private, post-quantum electronic cash system

[Ron Garret]

> On Dec 28, 2025, at 9:25 AM, Viktor S. Kristensen via cryptography <cryptography at metzdowd.com> wrote:
> 
> The unsettling truth: blockchain's greatest feature (immutability) becomes its greatest liability against HNDL attacks. You can't delete what you encrypted poorly. The chain remembers forever.

Well, that's true, except for one thing: block chains don't encrypt anything.  The only cryptography technology used in a block chain is hashes and digital signatures.  HNDL is not a threat because there is nothing to decrypt.  (There is also nothing to harvest since block chains are public by design.)

rg