Private digital monies must be secure against computing advances to achieve longevity. The design and
issuance of a cryptocurrency ledger utilising hash-based digital signatures which are resistant to classical
and quantum computing attack is presented.
The concept of a peer-to-peer internet ledger of value, recorded as a blockchain and secured by proof of work
was first reported in 2008. Bitcoin remains the most widely used cryptocurrency to date. Hundreds of
similar cryptocurrency ledgers have been subsequently created but with few exceptions they rely on the same
elliptic curve public-key cryptography (ECDSA) to generate digital signatures which allow transactions to
be verified securely. The most commonly used signature schemes today such as ECDSA, DSA and RSA
are theoretically vulnerable to quantum computing attack. It would be valuable to explore the design and
construction of a quantum resistant blockchain ledger to counter the potential advent of a sudden non-linear
quantum computing advance.