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In this chapter we consider the topological structure of two networks derived from Bitcoin’s public transaction history.

Bitcoin tries to prevent this attack by storing the mapping of a user to his or her public-keys on that user’s node only and by allowing each user to generate as many public-keys as required. An attacker wishing to de-anonymize users will attempt to construct the one-to-many mapping between users and public-keys, and associate information external to the system with the users.

Within the system, users are identified only by public-keys. Anonymity in Bitcoin, a peer-to-peer electronic currency system, is a complicated issue.

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