Lightning

1. 1
   Easy levelThe Multisignature Vault

   See how a coin can need two signatures: the lock at the heart of every channel.

   Open the model I've tried it

2. 2
   Explore levelThe Lightning Channel Machine

   Open a channel, pay in both directions and try to send more than one side has.

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   Optional challenge A channel has a capacity of 1,000,000 sat. Alice holds 990,000 sat and Bob 10,000 sat. Can Bob send Alice 50,000 sat?

   Yes, the capacity is 1,000,000 sat No: Bob can only send from his own balance, above the reserve Only if Alice is online Check answer

3. 3
   Advanced levelThe Lightning Channel Machine

   Close the channel and compare the on-chain transactions with paying each time on-chain.

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   Optional challenge Ten payments are made inside a channel, then it is closed cooperatively. How many on-chain transactions did the channel need?

   Ten Two: funding and closing Twelve Check answer

4. 4
   Explore levelThe Lightning Routing Machine

   Send a payment from Alice to Bob, who share no channel, and watch it find a route.

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   Optional challenge A route has enough capacity on every channel, yet the payment fails. Why?

   Capacity was miscounted One hop lacked liquidity on its sending side Lightning payments need a block confirmation Check answer

5. 5
   Explore levelThe Lightning Security Machine

   Let Alice publish an old state and find out when the cheat fails and when it works.

   Open the model I've tried it

   Optional challenge Alice publishes a revoked state. Bob is offline for longer than the time-lock delay and has no watchtower. What happens?

   Bob is automatically protected by the network The old state becomes final: Alice's cheat succeeds The channel is frozen forever Check answer

Finished? Choose another path or explore freely.