The quantum resistant ledger (QRL) is an open source public blockchain ledger designed using the post-quantum secure digital signature scheme XMSS to protect transactions. It is entirely programmed in python and is secured with a unique proof-of-stake algorithm consisting of a pseudorandom number function (PRF) HMAC_DRBG used to pseudorandomly select online stake validators identified cryptographically using signed iterative hash chains.
The QRL is different from bitcoin and all known cryptocurrency ledgers in that it uses hash-based digital signatures which are resistant to a theoretical quantum computer attack with Shor's algorithm - unlike popular blockchains such as bitcoin, ethereum or monero. This is the first block chain ledger to be designed to expressly resist a quantum computing attack or use a stateful signature scheme to secure transactions. It was announced in a whitepaper in November 2016 and is currently live with a p2p testnet. The open source repository for the node software may be found on github.
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