Who signs

  • Choose
  • Chain 12

Difficulty 3 of 5

The exchange holds 500 M USD and signs a withdrawal every 5 s at a fee of 0.4 USD. Yearly chance of compromise: 1 percent for an HSM, 2 percent for each online key or key share. Pick who signs: expected theft under 0.1 percent of funds a year and fees under 10,000 USD/day.

Play level

Options

  • One HSM holds the whole key and signs each withdrawal
  • A 2-of-3 multisig contract: two of three keys sign on chain
  • 2-of-3 MPC: two of three key shares make one signature
One data key seals many recordsTap or press Space to change how records get a key

Goals and limits

Theft risk
under 0.1%
Gas cost per day
under 10,000 USD/mo
p99 latency
under 30 s
Error rate
under 1%
Monthly cost
under 20 USD/mo
Traffic
0 req/s

Concepts

How players did

Player results load from the server.

All levels