Maxwell, Wuille Co-Author Proposal for a Big Boost to Bitcoin's Bandwidth

A newly-proposed relay protocol could reduce the "Transaction bandwidth" used up by bitcoin nodes by up to 75%. Called Erlay, the proposed protocol alters the way transactions are relayed so that they use significantly less bandwidth, an important resource for the nodes that make up the network.

The authors include The University of British Columbia researcher Gleb Naumenko as well as two bitcoin development heavy-weights: Greg Maxwell and Pieter Wuille.

The way bitcoin works is that nodes across the world tie together to form a network.

The results, according to Naumenko: "We save half of the bandwidth a node consumes, allow increasing connectivity almost for free, and, as a side effect, better withstand timing attacks. If outbound peer count were increased to 32, Erlay saves around 75% overall bandwidth compared to the current protocol."

One important result of this new protocol, the researchers argue, is that by reducing how much bandwidth this process takes, nodes can increase the number of connections they hold with other nodes.

The security of bitcoin depends at least partly on connections between nodes.

Naumenko described one such attack to CoinDesk: "The most trivial example is Eclipse attack, when a target node gets isolated from the longest chain, because all its connections are established with an attacker. In this case, an attacker, for example, can make a target node believe that they paid that target node, without actually submitting transactions to the longest chain."

If the protocol is so important for the security of bitcoin, what's next? Will it be added to Bitcoin Core, the most-popular software implementation of bitcoin?

"A couple weeks ago I chatted with several Bitcoin Core contributors and the feedback was generally positive, although they requested more experiments. Now, as those experiments are added, I would give more time for everybody to familiarize themselves with new technical bits," Naumenko told CoinDesk.

As a rule, new technology isn't added to bitcoin unless the most active contributors to the software, as well as the wider ecosystem that actually operates the nodes, agrees with it.