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Over the past decade, the Bitcoin P2P network protocol has become a referencemodel for all modern cryptocurrencies. While nodes in this network are known,the connections among them are kept hidden, as it is commonly believed thatthis helps protect from deanonymization and low-level attacks. However,adversaries can bypass this limitation by inferring connections through sidechannels. At the same time, the lack of topology information hinders theanalysis of the network, which is essential to improve efficiency and security.In this paper, we thoroughly review network-level attacks and empirically showthat topology obfuscation is not an effective countermeasure. We then arguethat the benefits of an open topology potentially outweigh its risks, andpropose a protocol to reliably infer and monitor connections among reachablenodes of the Bitcoin network. We formally analyze our protocol andexperimentally evaluate its accuracy in both trusted and untrusted settings.Results show our system has a low impact on the network, and has precision andrecall are over 90% with up to 20% of malicious nodes in the network.

AToM: Active Topology Monitoring for the Bitcoin Peer-to-Peer Network