The public ledger of cryptocurrencies is a book open to everyone. Amounts, timestamps, and transaction addresses are visible to the naked eye. But behind these numbers and letters lie real people, and this is where OSINT — open-source intelligence — comes into play.

The blockchain itself answers the questions "where" and "how much," but not "who." The chain of blocks is merely a map of fund movements. To link an anonymous address to a specific individual, one must go beyond the ledger. This is the essence of OSINT: collecting and analyzing publicly available information, which may include forum posts, domain registration data, old screenshots, or database leaks.

Why does it work?

Cryptocurrencies, unlike absolute anonymity, offer pseudonymity. Your address is a pseudonym, but all your actions on the network remain forever. One mistake — a publicly exposed wallet, a deposit on an exchange with KYC, or a mention on social media — and anonymity collapses. The entire methodology of OSINT investigations is built on this vulnerability.

Five application scenarios

Behind the acronym OSINT lies a whole range of tasks, from fighting fraud to market analysis.

  • Investigating theft and fraud: Independent analysts, such as ZachXBT, publish data that allows frozen stolen assets. For example, in the case of the $243 million theft from lender Genesis, such an investigation helped block over $9 million.
  • Compliance and sanctions screening: Cryptocurrency transactions cross jurisdictions. It is important not just to track a transfer, but to link it to a real person to comply with regulatory standards.
  • Threat Intelligence: Tracking fund flows associated with extortionists, illegal marketplaces, and financing of illicit activities.
  • Market analysis: The movement of funds by large holders ("whales") is perceived by traders as a signal of impending sell-offs or accumulation. OSINT allows identifying these players.
  • Journalistic investigations: The collapse of FTX began with a publication that compared corporate documents with on-chain data, revealing the business's dependence on the illiquid FTT token.

Four steps to de-anonymization

The investigation process rarely starts with a ready-made name. Usually, the analyst has an anomaly: a hacked contract or an address from a complaint. The methodology is divided into four stages:

  1. Lead: Determining the starting point — an incident, a specific address, or a wallet type.
  2. Data collection: Pure OSINT. Searching for any links between the address and the outside world: domain records, social media profiles, forum correspondence, database leaks.
  3. Attribution: Piecing together disparate facts. Addresses are grouped into clusters by counterparties and time, then linked to an exchange or service with KYC.
  4. Verification: Final check of connections for contradictions. It is important to remember: attribution is always probabilistic. It is not "this is definitely him," but "most likely him."

Analyst's arsenal

The toolkit of an OSINT analyst is much broader than just Etherscan or Chainalysis. It includes:

  • Blockchain explorers: Etherscan, Blockchair, Solscan for basic transaction viewing.
  • Visualization systems: Arkham, Breadcrumbs, OXT for displaying fund flows as a graph.
  • Commercial platforms: Chainalysis, TRM Labs, Elliptic for compliance and risk assessment (available to corporate clients).
  • Classic OSINT: Maltego for building relationship graphs, SpiderFoot for automated data collection, IntelligenceX for searching archives and leaks.
  • Geolocation and search: MaxMind for determining location by IP, Google dorks for narrowing search results.

The line between analysis and surveillance

OSINT is legal by nature, as it works with open data. However, problems arise at the stage of using the results. Erroneous attribution can harm an innocent person, and a published accusation remains online forever. Moreover, there are fundamental opponents of this approach. Supporters of privacy coins, such as Monero, consider financial secrecy an inalienable right, and OSINT a tool of total surveillance.

The transparency of the ledger is a double-edged sword. It helps analysts fight crime, but at the same time simplifies surveillance of legitimate users.

Expert opinion

The stories of ZachXBT and Coffeezilla clearly demonstrate that a special agent diploma is not needed for a successful investigation. What is needed is persistence, logic, and the ability to work with basic data. However, I want to emphasize the main point: the tool shows the data, but the final conclusion is made by a human. Blind trust in visualization algorithms is a path to false accusations. In a world where anyone can become a detective, responsibility for interpreting data becomes a key skill.