Past P2P digital cash projects failed primarily due to a lack of adequate decentralization. It all boils down to inspiring trust in market participants that your blockchain ledger is safe from a wide gamut of threats. One important factor is to ensure that the rules within the blockchain can’t be changed arbitrarily (e.g. total supply of coins, issuance rate, etc.). A second is that there needs to be a robust mechanism for enforcing the agreed upon rules. A third is wide distribution (in term...