A small team can build a useful cross-chain wallet tracker in a weekend — because blockchains are public by design. Every transaction on Ethereum, Solana, or an L2 is permanently readable by anyone. The engineering challenge isn't access; it's stitching identities across chains. Run the tracer below to see how funds are followed through a bridge.
How the tracker works
1 · Read the ledger
Explorers (Etherscan, Solscan) and node APIs expose every transfer: sender, receiver, amount, timestamp, contract called. A tracker just indexes this into a graph database — addresses as nodes, transactions as edges.
2 · Cross the bridge
Bridges are the hard part. When 5 ETH enters a bridge contract on Ethereum and 4.99 wETH exits to a fresh address on Solana 90 seconds later, no single chain records the link. Trackers correlate amount + timing + bridge event logs to connect the two — the same heuristic investigators used to trace the 2022 Wormhole and Ronin exploits.
3 · Cluster the identity
One person, many addresses. Clustering heuristics — common gas funders, co-spending patterns, exchange deposit reuse — collapse thousands of addresses into one entity. Chainalysis and Arkham build businesses on this; the core ideas are published research.
4 · Label the endpoints
Raw addresses become meaningful when tagged: "Binance hot wallet," "Uniswap router," "OFAC-sanctioned mixer." Labels come from exchange leaks, on-chain patterns, and community datasets. Once funds hit a labeled exchange, subpoenas can map address → real name.
The takeaway
"Pseudonymous" is not "anonymous." Your address history is a permanent, machine-readable biography — which is exactly why wallet-tracking tools are useful (portfolio monitoring, scam forensics, DAO treasury transparency) and why genuine on-chain privacy requires purpose-built systems (zero-knowledge proofs, shielded pools), not just fresh addresses.