Hudson Intelligence

What is Address Reuse?

Address reuse in cryptocurrency transactions reduces privacy and anonymity.

Reuse of an identical cryptocurrency address across multiple transactions potentially creates an opportunity for blockchain observers to attribute that address – and potentially other addresses under common control – to a particular person or entity.

What Does Address Reuse Look Like?

The diagram below is a depiction of address reuse, similar to how such data is rendered by cryptocurrency intelligence tools, which convert accounting entries from blockchain ledgers into visual maps or flowcharts.

This example shows one-to-one transfers across a series of intermediary addresses as digital money moves from one address to the next. At the end, an address seen earlier in the cycle is reused to receive the final transfer.

An analyst might attribute the final six addresses within this loop to the same person, subject to corroboration through additional blockchain analysis and other available evidence. Linking multiple addresses to the subject of an investigation can significantly expand the field of evidence.

In an actual blockchain investigation, this diagram and its underlying data would include hashes, fees, time/date stamps, attribution data, and other relevant information.

Why do Investigators Focus on Address Reuse?

A key challenge for blockchain tracing is identifying which branch of any transaction represents addresses owned and controlled by the subject of the investigation, as opposed to a third-party payment or exchange addresses. These include existing addresses controlled by the subject, and change addresses automatically generated by the subject’s wallet during transactions.

Money launderers and cryptocurrency fraudsters use various methods to obscure their identities and assets, including peel chains and layering, which can create complex loops of opaque transfers. Reuse of a known cryptocurrency address across multiple transactions may indicate that intervening addresses along the same transaction path are also controlled by the same person or entity. Combined with other blockchain heuristics and investigative evidence, address reuse can significantly strengthen ownership attribution.

Consult an Investigator

Hudson Intelligence assists law firms, businesses, public agencies and investors with cryptocurrency investigations and due diligence. Every investigation is led by a Cryptocurrency Tracing Certified Examiner (CTCE) and Certified Fraud Examiner (CFE). If you would like to discuss a potential investigation, please complete the form below. We also suggest reviewing our FAQ.