Defining the Cluster: A Formal Ontology for Blockchain Address Analysis and Intelligence Claims

Investigators and compliance teams rely on blockchain data to follow and seize illicit assets and make decisions about the customers they allow on their platforms. Yet the foundational concept behind blockchain analytics — the “cluster” — has never been formally defined and is actually comprised of three distinct analytical operations, each with different evidence standards, error characteristics, and consequences when wrong. The stakes are too high for ambiguity around this term to continue.

In this paper, Chainalysis presents the formal ontology we use to deconstruct the cluster into its constituent parts — assigning each a name, a definition, and an evidentiary standard. We introduce a two-tier evidence framework that separates structural claims from intelligence-driven attribution, and we propose a shared vocabulary the industry can use to hold itself accountable.

Download the report for a detailed exploration of:

• The components of “clusters”: How one term now obscures critical distinctions between address grouping, entity attribution, and operator determination, and why that matters for every downstream decision
• A new ontology for blockchain analytics: The formal vocabulary Chainalysis uses to break down analytical claims 
• A two-tier evidence framework: Why structural claims must be deterministic and reproducible, while attribution and intelligence claims require explicit source characterization and confidence levels
• The role of machine learning: Where trained predictive models belong in blockchain analytics – and, critically, where they don’t — with a clear boundary between leads and structural claims
• Implications for legal, compliance, research, and investigations: How the ontology provides clarity for vendor evaluation, academic benchmarking, and intelligence operations

This paper is a first step. We publish this framework as an opening proposal and an invitation to collaborate. Download your copy to see the framework we’ve built, refined, and defended, and join the conversation the industry urgently needs to have.