Posts from July 2016

Graph Databases: Dataflow vs. Traditional Models

graph stores weaver July 27, 2016 at 11:14 AM Ayush Dubey, Robert Escriva, and Emin Gün Sirer

Our thoughts on using differential dataflow to implement database functionality such as lookups and transactions.

How the Ethereum Hard Fork Can Fail

dao ethereum July 19, 2016 at 06:15 PM Emin Gün Sirer

The Ethereum hard fork is in a few days. Having looked at the proposed hard fork code, I discuss what I believe is the weakest part of the HF code.

Cross-Chain Replay Attacks

dao ethereum July 17, 2016 at 12:07 PM Emin Gün Sirer

Following a hard fork, there will be two chains. In cross-chain replay attacks, one can attack a smart contract by moving transactions from one chain to the other. Post describes a potential attack.

Reentrancy Woes in Smart Contracts

ethereum smart contracts July 13, 2016 at 10:45 AM Emin Gün Sirer

Reentrancy bugs are difficult to catch. This distilled, illustrative example shows how even a diligently-written contract with invariant checks can go wrong.