Chainalysis KYT Integration: Blockchain Transaction Monitoring for Regulated Businesses

Know Your Transaction (KYT) tooling — the use of blockchain analytics platforms to screen cryptocurrency transactions for links to illicit activity, sanctions-designated wallets, and high-risk counterparties — has become a standard requirement for regulated businesses handling cryptocurrency. Chainalysis KYT, alongside competitors including Elliptic, TRM Labs, and CipherTrace, provides the infrastructure layer that enables regulated Virtual Asset Service Providers (VASPs), EMIs, and crypto exchanges to meet their AML transaction monitoring obligations in the digital asset context. This article explains how KYT tools work, what they detect, why they are essential for regulated businesses, and how to integrate them effectively into an AML programme.

How Blockchain Analytics Works

The fundamental property of public blockchains (Bitcoin, Ethereum, and most major chains) that makes blockchain analytics possible is the public availability and immutability of the transaction ledger. Every transaction on the Bitcoin blockchain, for example, is permanently recorded and publicly visible: inputs (the sending addresses), outputs (the receiving addresses), values, and timestamps are all on-chain and accessible to anyone. Blockchain analytics firms such as Chainalysis maintain continuously updated databases that cluster wallet addresses into entities (exchanges, mixing services, darknet markets, sanctioned parties, etc.) using a combination of on-chain analysis techniques — co-spend heuristics, peel chain analysis, deposit address clustering — and off-chain intelligence (data from law enforcement, open sources, and proprietary intelligence).

When a regulated business receives a cryptocurrency deposit or initiates a withdrawal, a KYT query submits the relevant transaction or address to the analytics platform's API. The platform returns a risk score and a counterparty classification: has this address or transaction been linked to an illicit entity? What percentage of the funds in this transaction trace back to sanctioned addresses, darknet markets, ransomware wallets, or other high-risk categories? This risk intelligence is the basis for the compliance team's decision on whether to accept the transaction, investigate further, or report and freeze.

VASP Regulatory Requirements for KYT

UK-registered Virtual Asset Service Providers (under the MLR 2017 cryptoasset registration) are required by the FCA to implement an AML and CTF programme that includes transaction monitoring appropriate to their risk profile. While the FCA does not mandate a specific KYT tool, its guidance makes clear that manual review of blockchain transactions without automated tooling is insufficient for businesses processing material volumes. The FCA's supervisory expectations, expressed through its 2022–2024 VASP registration review process, effectively require registered VASPs to demonstrate use of a recognised blockchain analytics platform as a component of their transaction monitoring programme.

In the EU, MiCA Article 72 requires Crypto Asset Service Providers (CASPs) authorised under MiCA to implement appropriate AML procedures, which similarly implies KYT tooling for businesses transacting in cryptocurrency at scale. FATF Recommendation 15 (on new technologies) requires countries to ensure that VASPs apply risk-based AML measures including transaction monitoring, which cascades into national regulatory requirements across FATF member jurisdictions.

What KYT Detects: Key Risk Categories

KYT platforms categorise risk into multiple entity types. The highest-risk categories that trigger immediate review requirements are:

• Sanctions-designated wallets: OFAC's SDN list, UK OFSI-designated wallets, EU sanctions lists include specific wallet addresses. Transacting with a sanctions-designated wallet is a strict liability offence under UK/US/EU sanctions law. KYT tools maintain up-to-date sanctions address databases and flag direct transactions with sanctioned wallets as the highest-risk category.
• Darknet markets: Hydra, AlphaBay, and successor darknet markets have known wallet addresses that Chainalysis and competitors have identified through public blockchain analysis and law enforcement cooperation. Funds with darknet market exposure in their transaction history are a significant red flag.
• Ransomware: Ransomware wallets — addresses used to receive ransom payments from victims of ransomware attacks — are tracked extensively. Several ransomware groups have been OFAC-designated, making transactions with these addresses a sanctions compliance issue.
• Mixing and tumbling services: Cryptocurrency mixing services (Bitcoin mixer, Tornado Cash and successors) obfuscate transaction trails by pooling funds. Tornado Cash was OFAC-designated in August 2022; interacting with its smart contracts is a sanctions violation. More broadly, use of mixing services is a significant indicator of an attempt to break the transaction audit trail, which is suspicious regardless of OFAC designation.
• High-risk exchanges: Some exchanges operating in lax regulatory jurisdictions or with historically high proportions of illicit funds processed are classified as high-risk counterparties. Indirect exposure to these exchanges — funds that transited through them in the recent transaction history — generates elevated risk scores.

Exposure Calculation: Direct vs Indirect

KYT platforms distinguish between direct exposure (a wallet that was itself used by a sanctioned party or illicit entity) and indirect exposure (a wallet that received funds from, or sent funds to, an intermediate wallet that was linked to a high-risk entity). The concept of "hops" — the number of transactions between the analysed wallet and the high-risk entity — is central to risk scoring.

Direct exposure (0 hops) is the most serious: the analysed wallet was directly involved with the high-risk entity. One hop means the analysed wallet received funds directly from the high-risk entity's wallet. Higher hop counts mean the link is more indirect and the risk weight is typically lower, though different platforms weight hop counts differently. A business receiving a deposit where 30% of the funds trace back (at two hops) to a known darknet market wallet should treat this differently to a business receiving a deposit where 0.1% trace back at ten hops to an old unrelated transaction cluster.

At CCYFX, our KYT programme uses Chainalysis KYT for all incoming and outgoing cryptocurrency transactions processed through our crypto on/off-ramp service. Risk alerts above defined thresholds are reviewed by the compliance team under GP's oversight, with outcomes documented and — where warranted — reported to the NCA via the SAR process. Our risk thresholds and review process are calibrated to the risk profile of our client base and the specific assets we support.

Integrating KYT with AML Policy

Effective KYT integration requires more than simply subscribing to a blockchain analytics platform. The tool must be integrated into the firm's AML policy as a documented control, with defined: risk score thresholds for different action levels (auto-accept, enhanced review, auto-reject, freeze and investigate), responsibilities for alert review and escalation, documentation requirements for reviewed transactions, timeframes for action, and periodic testing of the alert configuration against known high-risk cases. The KYT tool configuration and threshold decisions should be reviewed at least annually by the MLRO and documented in the annual AML report to the Board.

For businesses considering entering the crypto on/off-ramp space or seeking to demonstrate adequate KYT controls to their banking providers, CCYFX can provide guidance on industry-standard KYT programme design. Contact our compliance team to discuss your specific requirements.