smart contracts

First Blood ICO


First Blood will be a decentralized platform to let eSports players bet on games and challenge each other for cryptocurrency stakes. Smart contracts and oracles will manage payouts. The crowdsale starts midnight GMT September 26; 5pm PST Sept 25th.

Blindly Signed Contracts: Anonymous On-Blockchain and Off-Blockchain Bitcoin Transactions


Although Bitcoin is often perceived to be an anonymous currency, research has shown that a user’s Bitcoin transactions can be linked to compromise the user’s anonymity. We present solutions to the anonymity problem for both transactions on Bitcoin’s blockchain and off the blockchain (in so called micropayment channel networks). We use an untrusted third party […]

Bitcoin Covenants


This paper presents an extension to Bitcoin’s script language enabling covenants, a primitive that allows transactions to restrict how the value they transfer is used in the future. Covenants expand the set of financial instruments expressible in Bitcoin, and enable new powerful and novel use cases. We illustrate two novel security constructs built using covenants. […]