Chain Analysis

Chain analysis is a foundational compliance capability for any payment operator that accepts, holds, or transmits stablecoins or other virtual assets. Traditional financial crime compliance tools — designed for fiat account-to-account transfers — cannot evaluate the provenance of on-chain funds. A stablecoin payment arriving at a merchant’s wallet may carry exposure to mixer services, sanctions-designated addresses, or ransomware wallets that no conventional sanctions screen would detect.

How Address Clustering Works

Public blockchains record every transaction permanently, but wallet addresses are pseudonymous rather than anonymous. Chain analysis platforms exploit blockchain structural properties to cluster addresses into likely entities:

Common input ownership: When a transaction’s inputs are controlled by multiple addresses, those addresses are likely controlled by the same wallet, since the private keys for all inputs must sign the transaction.

Change address heuristics: UTXO-based chains (Bitcoin, Litecoin) create change addresses in predictable patterns that help analysts trace fund flows across address rotations.

Deposit address reuse: Exchanges often reuse deposit addresses or exhibit predictable derivation paths, allowing clustering of many user deposit addresses under a single exchange entity label.

Real-Time vs Batch Screening

Chain analysis can be implemented at different points in a payment flow:

Pre-deposit screening: Evaluating the source wallet’s risk score before crediting an inbound stablecoin transfer. This is the standard for regulated crypto businesses and some progressive payment operators.

Real-time KYT (Know Your Transaction): Chainalysis KYT and TRM Labs provide API-based real-time transaction monitoring that assigns risk scores at the moment of transaction submission, enabling automated blocking or flagging of high-risk transfers.

Batch / retrospective monitoring: Periodic review of historical transaction flows, used for ongoing monitoring and SAR filing obligations rather than pre-approval gating.

Limitations and Why It Is Necessary

Chain analysis is probabilistic: address clustering can produce false positives (attributing an address to an entity incorrectly) and cannot trace funds that have passed through effective mixing services or privacy-preserving protocols. Despite these limitations, regulators in the US, EU, and Singapore treat the absence of chain analysis tooling as a material AML deficiency for VASPs and payment operators handling virtual assets. Traditional sanctions screening against a static SDN list does not cover crypto wallet addresses without dedicated on-chain tooling.