Over 50 years after the first inter-networked message, peer-to-peer networks remain rare beasts in the jungle of the Internet. Bitcoin’s ability to provide an open monetary system depends on its peer-to-peer architecture, and across its attack surface it is the networking layer–how peers discover and connect to each other–that is the most vulnerable. There are two main places problems can occur: Bitcoin’s own peering protocol, and the Internet protocols that Bitcoin’s protocol depends on. In this light Core has a dual mandate to prevent Denial of Service (DOS) vectors that can be abused between nodes, and enable nodes to communicate safely in the wider adversarial environment…

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