[{"data":1,"prerenderedAt":428},["ShallowReactive",2],{"tag-solana":3},[4],{"_path":5,"_dir":6,"_draft":7,"_partial":7,"_locale":8,"title":9,"description":10,"slug":11,"date":12,"lastUpdated":12,"author":13,"readingTime":14,"category":15,"tags":16,"ogImage":23,"featured":7,"body":24,"_type":422,"_id":423,"_source":424,"_file":425,"_stem":426,"_extension":427},"\u002Farticles\u002F13-cross-chain-bridges-asset-tracing","articles",false,"","Cross-chain bridges and why they complicate asset tracing","An explanation of how cross-chain bridges interrupt blockchain transaction trails and the forensic methods used to reconnect funds across networks.","cross-chain-bridges-asset-tracing","2026-05-16","Nick Kampe",7,"Education",[17,18,19,20,21,22],"cross-chain","bridges","asset-tracing","blockchain-forensics","ethereum","solana","\u002Fog\u002Fcross-chain-bridges-asset-tracing.png",{"type":25,"children":26,"toc":406},"root",[27,35,42,47,52,57,63,68,90,104,110,115,126,144,154,164,170,175,185,195,205,215,225,235,241,246,256,261,271,281,291,297,302,315,328,333,338,344,351,361,367,376,382,391,397],{"type":28,"tag":29,"props":30,"children":31},"element","p",{},[32],{"type":33,"value":34},"text","A decade ago, digital asset tracing meant following a single chain of transactions on a single blockchain. Today, an investigator tracing misappropriated cryptocurrency may find that the funds passed through two or three different blockchain networks before reaching a final destination. Cross-chain bridges are the mechanism that makes this possible, and they are one of the most significant complications in modern blockchain forensic analysis.",{"type":28,"tag":36,"props":37,"children":39},"h2",{"id":38},"what-a-bridge-is",[40],{"type":33,"value":41},"What a Bridge Is",{"type":28,"tag":29,"props":43,"children":44},{},[45],{"type":33,"value":46},"A cross-chain bridge is a protocol that allows digital assets to move between two different blockchains. Because blockchains are independent systems with no native awareness of each other, direct transfer between chains is not possible. Bridges solve this by using a lock-and-mint or burn-and-release mechanism.",{"type":28,"tag":29,"props":48,"children":49},{},[50],{"type":33,"value":51},"In a lock-and-mint bridge: a user deposits assets on Chain A into the bridge's smart contract (locking them), and the bridge mints an equivalent \"wrapped\" token on Chain B representing the locked asset. In a burn-and-release bridge: the user burns or destroys the wrapped token on Chain B, and the bridge releases the original asset on Chain A.",{"type":28,"tag":29,"props":53,"children":54},{},[55],{"type":33,"value":56},"From a user's perspective, the experience is simple: send ETH on Ethereum, receive the equivalent value on Arbitrum (or Polygon, or Solana, or BNB Chain). From a forensic perspective, the transaction trail fragments at the bridge.",{"type":28,"tag":36,"props":58,"children":60},{"id":59},"why-bridges-break-the-trace",[61],{"type":33,"value":62},"Why Bridges Break the Trace",{"type":28,"tag":29,"props":64,"children":65},{},[66],{"type":33,"value":67},"When funds move through a bridge, the address on the source chain and the address on the destination chain are generally different, not just different in value but completely independent identifiers with no cryptographic relationship to each other.",{"type":28,"tag":29,"props":69,"children":70},{},[71,73,80,82,88],{"type":33,"value":72},"On Ethereum, an address looks like ",{"type":28,"tag":74,"props":75,"children":77},"code",{"className":76},[],[78],{"type":33,"value":79},"0x4a...e31",{"type":33,"value":81},". On Solana, addresses look like ",{"type":28,"tag":74,"props":83,"children":85},{"className":84},[],[86],{"type":33,"value":87},"BhwN...mR4X",{"type":33,"value":89},". These are not the same format, the same cryptographic scheme, or the same namespace. A user who sends ETH from their Ethereum address to a Solana bridge to receive SOL on the other side has effectively created two endpoints on two completely different ledger systems.",{"type":28,"tag":29,"props":91,"children":92},{},[93,95,102],{"type":33,"value":94},"Without bridge-specific tooling and knowledge of how the specific bridge protocol records its transactions, the trace appears to terminate at the bridge contract on the source chain. The investigator sees funds enter the bridge and disappear from the source blockchain. Finding where they emerged on the destination chain requires a separate analysis of ",{"type":28,"tag":96,"props":97,"children":99},"a",{"href":98},"\u002Fresources\u002Fhow-to-read-a-blockchain-transaction",[100],{"type":33,"value":101},"how to read a blockchain transaction",{"type":33,"value":103},".",{"type":28,"tag":36,"props":105,"children":107},{"id":106},"how-forensic-analysts-trace-across-bridges",[108],{"type":33,"value":109},"How Forensic Analysts Trace Across Bridges",{"type":28,"tag":29,"props":111,"children":112},{},[113],{"type":33,"value":114},"Each major bridge has identifiable transaction patterns that allow forensic reconstruction:",{"type":28,"tag":29,"props":116,"children":117},{},[118,124],{"type":28,"tag":119,"props":120,"children":121},"strong",{},[122],{"type":33,"value":123},"Matching amounts and timing",{"type":33,"value":125},": For many bridges, the amount deposited on Chain A and the amount received on Chain B will match (minus fees), and the timing is close. If an analyst sees a bridge deposit of exactly 12.4 ETH at 14:23:07 UTC, and finds a 12.4 ETH equivalent receipt on the destination chain at 14:24:52 UTC, the match is highly probable.",{"type":28,"tag":29,"props":127,"children":128},{},[129,134,136,142],{"type":28,"tag":119,"props":130,"children":131},{},[132],{"type":33,"value":133},"Bridge protocol event logs",{"type":33,"value":135},": Most bridges emit events (log entries in the smart contract) that record the destination address the user specified. For example, Stargate Finance logs the destination address as part of its ",{"type":28,"tag":74,"props":137,"children":139},{"className":138},[],[140],{"type":33,"value":141},"SendMsg",{"type":33,"value":143}," event. An analyst can query these events to determine where on the destination chain the funds were directed.",{"type":28,"tag":29,"props":145,"children":146},{},[147,152],{"type":28,"tag":119,"props":148,"children":149},{},[150],{"type":33,"value":151},"Relayer and validator records",{"type":33,"value":153},": Some bridges use third-party relayers or validators that maintain their own records of bridge transactions. These may be queryable.",{"type":28,"tag":29,"props":155,"children":156},{},[157,162],{"type":28,"tag":119,"props":158,"children":159},{},[160],{"type":33,"value":161},"Wrapped token issuance",{"type":33,"value":163},": When a bridge mints a wrapped token on the destination chain, the mint transaction is recorded on that chain and includes the receiving address. Tracing the minted tokens' receiving address can pick up the trace on the destination chain.",{"type":28,"tag":36,"props":165,"children":167},{"id":166},"the-major-bridges-in-current-litigation",[168],{"type":33,"value":169},"The Major Bridges in Current Litigation",{"type":28,"tag":29,"props":171,"children":172},{},[173],{"type":33,"value":174},"Several bridges appear frequently in litigation-relevant fund flows:",{"type":28,"tag":29,"props":176,"children":177},{},[178,183],{"type":28,"tag":119,"props":179,"children":180},{},[181],{"type":33,"value":182},"Stargate Finance",{"type":33,"value":184},": One of the highest-volume EVM cross-chain bridges; connects Ethereum, Arbitrum, Optimism, Base, Avalanche, BNB Chain, and others. Transaction events contain destination address data.",{"type":28,"tag":29,"props":186,"children":187},{},[188,193],{"type":28,"tag":119,"props":189,"children":190},{},[191],{"type":33,"value":192},"Hop Protocol",{"type":33,"value":194},": EVM-to-EVM bridge with human-readable event structures.",{"type":28,"tag":29,"props":196,"children":197},{},[198,203],{"type":28,"tag":119,"props":199,"children":200},{},[201],{"type":33,"value":202},"Synapse Protocol",{"type":33,"value":204},": Cross-chain bridge supporting Ethereum, Arbitrum, Optimism, BSC, Avalanche, and others. Known for relatively clean forensic tracing.",{"type":28,"tag":29,"props":206,"children":207},{},[208,213],{"type":28,"tag":119,"props":209,"children":210},{},[211],{"type":33,"value":212},"Wormhole",{"type":33,"value":214},": Cross-chain protocol supporting Ethereum-to-Solana and other heterogeneous bridge pairs. The Solana-Ethereum connection is particularly significant as funds laundered through Solana often use Wormhole.",{"type":28,"tag":29,"props":216,"children":217},{},[218,223],{"type":28,"tag":119,"props":219,"children":220},{},[221],{"type":33,"value":222},"Native L2 bridges",{"type":33,"value":224},": Every major Ethereum Layer 2 (Arbitrum, Optimism, Base, Polygon) has a canonical bridge operated by the network itself. These generally have more structured transaction records and are often easier to trace.",{"type":28,"tag":29,"props":226,"children":227},{},[228,233],{"type":28,"tag":119,"props":229,"children":230},{},[231],{"type":33,"value":232},"LayerZero",{"type":33,"value":234},": A cross-chain messaging protocol rather than a bridge per se, but used by many bridging protocols. Understanding LayerZero's transaction structure is important for tracing funds that use protocols built on it.",{"type":28,"tag":36,"props":236,"children":238},{"id":237},"limitations-introduced-by-bridges",[239],{"type":33,"value":240},"Limitations Introduced by Bridges",{"type":28,"tag":29,"props":242,"children":243},{},[244],{"type":33,"value":245},"Bridge tracing introduces genuine analytical uncertainty that must be disclosed. The specific uncertainty depends on the bridge:",{"type":28,"tag":29,"props":247,"children":248},{},[249,254],{"type":28,"tag":119,"props":250,"children":251},{},[252],{"type":33,"value":253},"Timing windows",{"type":33,"value":255},": Some bridges batch transactions, meaning multiple deposits may be aggregated and delivered to the destination chain in a combined transaction. When batching occurs, precisely matching a specific deposit to a specific receipt requires additional analysis.",{"type":28,"tag":29,"props":257,"children":258},{},[259],{"type":33,"value":260},"Hypothetical example: A user deposits 12.4 ETH into a bridge, then several unrelated users make deposits of the same amount before a batch reaches the destination chain. Matching the amount and timing alone may not distinguish the user's receipt from the others.",{"type":28,"tag":29,"props":262,"children":263},{},[264,269],{"type":28,"tag":119,"props":265,"children":266},{},[267],{"type":33,"value":268},"Privacy bridges",{"type":33,"value":270},": A small number of bridge protocols include privacy features that intentionally obscure the relationship between source and destination deposits. These function similarly to mixing services and reduce attribution confidence proportionally.",{"type":28,"tag":29,"props":272,"children":273},{},[274,279],{"type":28,"tag":119,"props":275,"children":276},{},[277],{"type":33,"value":278},"Protocol changes and chain reorganizations",{"type":33,"value":280},": Bridges are software that can be upgraded. A bridge that operated differently at a prior point in time may require historical analysis of contract versions.",{"type":28,"tag":29,"props":282,"children":283},{},[284,289],{"type":28,"tag":119,"props":285,"children":286},{},[287],{"type":33,"value":288},"Destination chain expertise",{"type":33,"value":290},": Tracing funds from Ethereum to Solana means the investigator must be competent on both chains. The Solana data model is structurally different from EVM chains. An analyst who handles EVM chains comfortably may not have the tooling or knowledge to continue a trace on Solana.",{"type":28,"tag":36,"props":292,"children":294},{"id":293},"what-this-means-for-your-matter",[295],{"type":33,"value":296},"What This Means for Your Matter",{"type":28,"tag":29,"props":298,"children":299},{},[300],{"type":33,"value":301},"If your client's case involves a party who moved funds across chains, several practical points apply:",{"type":28,"tag":29,"props":303,"children":304},{},[305,307,313],{"type":33,"value":306},"First, the trace is not necessarily lost at the bridge. It is broken and must be reconnected. That reconnection is possible in most cases involving major, well-documented bridges. It requires ",{"type":28,"tag":96,"props":308,"children":310},{"href":309},"\u002Fservices#blockchain-tracing",[311],{"type":33,"value":312},"blockchain tracing",{"type":33,"value":314}," by a forensic analyst who works across multiple blockchain ecosystems and knows the specific bridge's transaction structure.",{"type":28,"tag":29,"props":316,"children":317},{},[318,320,326],{"type":33,"value":319},"Second, each bridge crossing introduces a documentation requirement in the expert analysis. The chain of custody for the trace must explicitly address what was done on each chain and how the cross-chain connection was established. A report that simply says \"funds moved across a bridge\" without documenting the specific bridge, the matching methodology, and the confidence level for the connection is inadequate. The ",{"type":28,"tag":96,"props":321,"children":323},{"href":322},"\u002Fmethodology",[324],{"type":33,"value":325},"methodology",{"type":33,"value":327}," should make that cross-chain connection reviewable.",{"type":28,"tag":29,"props":329,"children":330},{},[331],{"type":33,"value":332},"Third, bridge transactions are sometimes used deliberately to complicate tracing. An adversary who moves funds across three bridges through three blockchains before depositing at an exchange is attempting to impose analytical friction. That friction is real but not necessarily decisive. Experienced forensic analysts have established methodologies for tracing across the most common bridge protocols.",{"type":28,"tag":29,"props":334,"children":335},{},[336],{"type":33,"value":337},"The first question to ask when a trace appears to terminate at a bridge contract is not \"can we follow this?\" but \"which bridge is this, and what does its transaction record show about where the funds went?\"",{"type":28,"tag":36,"props":339,"children":341},{"id":340},"frequently-asked-questions",[342],{"type":33,"value":343},"Frequently Asked Questions",{"type":28,"tag":345,"props":346,"children":348},"h3",{"id":347},"q-what-should-i-ask-the-expert-to-show-before-relying-on-a-bridge-crossing-in-the-case",[349],{"type":33,"value":350},"Q: What should I ask the expert to show before relying on a bridge crossing in the case?",{"type":28,"tag":29,"props":352,"children":353},{},[354,359],{"type":28,"tag":119,"props":355,"children":356},{},[357],{"type":33,"value":358},"A:",{"type":33,"value":360}," Ask the expert to identify the bridge protocol, the transactions on both chains, the method used to connect them, and the confidence level for that connection. The report should also explain what the bridge record shows about the destination address. A statement that funds crossed a bridge, without that supporting analysis, does not show how the conclusion was reached.",{"type":28,"tag":345,"props":362,"children":364},{"id":363},"q-is-a-matching-amount-and-a-close-timestamp-enough-to-prove-where-the-funds-emerged",[365],{"type":33,"value":366},"Q: Is a matching amount and a close timestamp enough to prove where the funds emerged?",{"type":28,"tag":29,"props":368,"children":369},{},[370,374],{"type":28,"tag":119,"props":371,"children":372},{},[373],{"type":33,"value":358},{"type":33,"value":375}," Matching amounts and timing can make a cross-chain match highly probable, particularly when fees account for a small difference. They are not always conclusive because a bridge may batch multiple deposits into one destination transaction. The analysis should address the bridge's transaction pattern and any additional evidence that links the source deposit to the receipt.",{"type":28,"tag":345,"props":377,"children":379},{"id":378},"q-what-are-the-main-grounds-to-question-a-bridge-tracing-opinion",[380],{"type":33,"value":381},"Q: What are the main grounds to question a bridge-tracing opinion?",{"type":28,"tag":29,"props":383,"children":384},{},[385,389],{"type":28,"tag":119,"props":386,"children":387},{},[388],{"type":33,"value":358},{"type":33,"value":390}," Counsel can examine whether the opinion accounts for batching, privacy features, and the version of the bridge protocol operating at the relevant time. A chain reorganization or a prior contract version can require historical analysis rather than reliance on current behavior. Counsel can also examine whether the analyst has the tools and expertise to trace the destination chain, especially where the trace moves between an EVM chain and Solana.",{"type":28,"tag":345,"props":392,"children":394},{"id":393},"q-what-should-counsel-do-first-when-the-transaction-trail-appears-to-end-at-a-bridge-contract",[395],{"type":33,"value":396},"Q: What should counsel do first when the transaction trail appears to end at a bridge contract?",{"type":28,"tag":29,"props":398,"children":399},{},[400,404],{"type":28,"tag":119,"props":401,"children":402},{},[403],{"type":33,"value":358},{"type":33,"value":405}," Identify the bridge and obtain the transaction records and event logs associated with the source-chain deposit. Those records may identify the destination address, and the destination chain can then be analyzed for the related receipt or wrapped-token issuance. The apparent endpoint may therefore be a point for reconnecting the trace, rather than evidence that the assets cannot be followed.",{"title":8,"searchDepth":407,"depth":407,"links":408},2,[409,410,411,412,413,414,415],{"id":38,"depth":407,"text":41},{"id":59,"depth":407,"text":62},{"id":106,"depth":407,"text":109},{"id":166,"depth":407,"text":169},{"id":237,"depth":407,"text":240},{"id":293,"depth":407,"text":296},{"id":340,"depth":407,"text":343,"children":416},[417,419,420,421],{"id":347,"depth":418,"text":350},3,{"id":363,"depth":418,"text":366},{"id":378,"depth":418,"text":381},{"id":393,"depth":418,"text":396},"markdown","content:articles:13-cross-chain-bridges-asset-tracing.md","content","articles\u002F13-cross-chain-bridges-asset-tracing.md","articles\u002F13-cross-chain-bridges-asset-tracing","md",1790145013678]