Hot and cold

  • Build
  • Chain 11

Difficulty 4 of 5

The exchange holds 200 M USD. Users withdraw 2,000 USD every 2 s and 250,000 USD every 3 min. A hot key is stolen in 5 percent of years. Cold signing needs 3 approvers, 5 a minute at most. Refills take 15 min. Expected theft under 0.1 percent a year, failures under 1 percent.

Play level

HTTP/2JSON-RPCJSON-RPCUsers0.51 req/sHot wallet1 vCPU · 1 GBCold wallet0.25 vCPU · 1 GBAccount cha…1 vCPU · 1 GB
HTTP/2JSON-RPCJSON-RPCUsers0.51 req/sHot wallet1 vCPU · 1 GBCold wallet0.25 vCPU · 1 GBAccount cha…1 vCPU · 1 GB
The board at the start of the level
One data key seals many recordsTap or press Space to change how records get a key

Envelope keys · < 1 key service calls/s · limit 10,000/s

Goals and limits

Theft risk
under 0.1%
Error rate (Small)
under 1%
Error rate (Large)
under 1%
p99 latency (Small)
under 30 s
Gas cost per day (Small)
under 45,000 USD/mo
Monthly cost
under 30 USD/mo
Parts you can add
API gateway, Load balancer (L7), Hot wallet
Part limit
4
Traffic
1 req/s

Concepts

How players did

Player results load from the server.

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