Ledger LandISSUE #83 of 90

on-chain analytics · dune · nansen · etherscan

BlockyVSDouble-Spend Dan

Blocky saysOn-chain analytics tools (Dune, Nansen, Etherscan) turn raw chain data into insight.

Every transaction is public, so you can analyze flows directly. Etherscan is the block explorer for inspecting addresses and contracts; Dune lets you write SQL over decoded chain data to build dashboards; Nansen labels wallets ("smart money", exchanges) for behavioral analysis. This transparency is unique to blockchains — the whole ledger is queryable.

Power-ups you unlock

All transactions are public and queryable
Etherscan: inspect addresses/contracts
Dune: SQL dashboards over chain data
Nansen: labeled wallets, money flows

Double-Spend Dan attacks — common mistakes

Assuming on-chain activity is anonymous (it’s pseudonymous)
Reading labels as ground truth
Ignoring that addresses can be clustered/deanonymized

Boss battlePick the right tool to: inspect one transaction, build a dashboard, track smart money.

Example code

<!doctype html><html><head><meta charset="utf-8"></head>
<body style="background:#06040d;color:#e6e0ff;font-family:monospace;padding:20px"><pre>one tx/address → Etherscan
SQL dashboard   → Dune
labeled flows   → Nansen</pre></body></html>

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