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Crypto investigations follow money across several blockchains rather than along a single transaction history. Bridges, exchanges and swap services connect markets, but they also allow illicit actors to move between systems with different records. Cross-chain tracking attempts to reconstruct that trail.
Elliptic’s 2025 research identified more than USD 21 billion in illicit and high-risk activity routed through cross-chain services by May 2025, approximately triple its 2023 estimate. This describes cumulative identified activity rather than losses occurring exclusively during 2025.
The company also reported that 33% of investigations involved more than three blockchains, while 20% spanned more than ten. Those findings help explain why examining a single address on one explorer can leave investigators with an incomplete picture.
Chainalysis estimated that illegal addresses received at least USD 154 billion in 2025. Stablecoins represented 84% of illicit transaction volume, showing why investigations cannot focus exclusively on Bitcoin.
A bridge transaction may lock or otherwise move assets on one network while releasing or issuing corresponding value elsewhere. Investigators need to connect the originating event with its destination, rather than assuming both appear in one ledger.
Some systems expose identifiers that support direct matching, and others require comparison of amounts, timing, addresses and service behavior. Fees, asset conversions, and aggregated transactions can make these relationships harder to establish.
An August 2026 study classified matching techniques into deterministic identifiers, field constraints and model-assisted methods. It emphasized that reliability depends heavily on what evidence each system exposes, including information held outside blockchains.
A September 10, 2026 preprint introduced SolTracer, a proposed method for matching transfers into Solana despite differences in execution structure, reporting a 20.16% improvement in F1 score over their strongest comparison method under a specified experimental setting.
That is a research result, not a universal accuracy claim or evidence of deployment by investigators. However, it shows the technical direction: tools must understand networks rather than apply assumptions everywhere.
The review also found that fewer than half of the assessed datasets and research artifacts remained obtainable. Reproducibility, therefore, matters alongside impressive performance figures.
Reconstructing a trail can reveal exchanges or services where investigators might seek information or intervention. However, matching transfers does not establish the identity or intent of everyone involved.
Investigators must document uncertainty, distinguish criminal proceeds from broader risk exposure and corroborate findings. Recovery additionally depends on accessible assets and cooperation, rather than on tracing technology alone.
Cross-chain analytics is changing investigations by preserving continuity across fragmented networks. Its value will depend on verifiable links, reproducible methods and careful interpretation as criminals and legitimate users adopt increasingly interconnected systems.
Why this Matters
As crypto activity spreads across multiple blockchains, criminals can exploit fragmented transaction records to complicate investigations. Cross-chain tracking helps reconnect these trails, potentially improving attribution, intervention and asset recovery when combined with reliable evidence.
Cross-chain tracking is becoming increasingly important as digital assets move between interconnected networks. Better matching methods can strengthen investigations, but tracing funds alone cannot prove identity, criminal intent or guarantee asset recovery.
Also Read: Russia's Digital Ruble Expands as Crypto Activity Keeps Rising
1. What is cross-chain tracking in cryptocurrency?
Cross-chain tracking is the process of following cryptocurrency as it moves between different blockchain networks. Investigators attempt to connect transactions involving bridges, exchanges and swap services to reconstruct a continuous financial trail.
2. How much illicit activity involves cross-chain services?
Elliptic identified more than USD 21 billion in cumulative illicit and high-risk activity routed through cross-chain services by May 2025. The figure was approximately three times its 2023 estimate.
3. Why are cross-chain crypto transactions difficult to trace?
Different blockchains maintain separate transaction records and can use different technical structures. Investigators may need to compare transaction identifiers, amounts, timestamps, addresses and service behavior to determine whether transfers across networks are connected.
4. What is SolTracer and how could it help crypto investigations?
SolTracer is a research method designed to match cross-chain transfers entering Solana despite its distinctive execution structure. Researchers reported a 20.16% F1-score improvement over their strongest comparison method under one experimental setting.
5. Can cross-chain tracking identify crypto criminals automatically?
No. Tracking can reconstruct how assets moved and identify services they encountered, but it does not automatically prove who controlled a wallet or why a transaction occurred. Investigators still require corroborating evidence and appropriate legal processes.
