We present a distributed ”proof-of-stake” e-cash system that can tolerate an
controlling up to 1/3 of the stake. We argue that bitcoin’s proof-of-work can
to some extent by an unbiased source of randomness and an assumption on the
of honest players’ majority during each user’s offline time. Also we describe a
players to insert unbiased randomness into the blockchain.
cryptocurrency, bitcoin, proof of stake, unbiased randomness, proof of security