⛓️ Blockchain & Web3 · C4 Architecture · Pro
Crypto Exchange Architecture
The main parts of a centralised crypto exchange: a matching engine, wallets split between hot and cold storage, deposits and withdrawals, and compliance checks.
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Drawing diagram…
What this diagram shows
- Most funds are kept in offline cold wallets
- Withdrawals pass compliance and risk checks
- The matching engine keeps its order book in memory
Prompt used
Crypto exchange: traders use web and mobile apps through an API gateway. The matching engine keeps the order book in memory and writes trades to a trade log. A ledger service tracks every user's balances. A wallet service manages hot wallets for daily withdrawals and cold wallets (offline, multi-signature) for most funds, and watches blockchain nodes for deposits. A compliance service does KYC, travel rule and sanctions screening for withdrawals.
Mermaid code
C4Container
title Crypto Exchange
Person(trader, "Trader", "Buys and sells crypto")
System_Boundary(ex, "Exchange") {
Container(app, "Trading Apps", "React / React Native", "Charts and orders")
Container(gw, "API Gateway", "Go", "REST and WebSocket")
Container(me, "Matching Engine", "C++", "In-memory order book")
Container(led, "Ledger Service", "Java", "User balances")
Container(wal, "Wallet Service", "Go", "Deposits and withdrawals")
Container(comp, "Compliance Service", "Python", "KYC and screening")
ContainerDb(db, "Ledger DB", "PostgreSQL", "Balances and trades")
}
System_Ext(nodes, "Blockchain Nodes", "Bitcoin, Ethereum")
System_Ext(cold, "Cold Wallet", "Offline multi-signature")
Rel(trader, app, "Uses")
Rel(app, gw, "Orders and quotes")
Rel(gw, me, "Places orders")
Rel(me, led, "Settles trades")
Rel(led, db, "Reads/writes")
Rel(gw, wal, "Withdraw request")
Rel(wal, comp, "Screen withdrawal")
Rel(wal, nodes, "Broadcasts and watches")
Rel(wal, cold, "Refills hot wallet")Related templates
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