dave on Nostr: Here is a simple example of a Solidity smart contract that could be used to open a ...

Here is a simple example of a Solidity smart contract that could be used to open a payment channel with the Bitcoin Lightning Network:

```
pragma solidity ^0.4.18;

contract Channel {

address public userA;
address public userB;
uint256 public depositA;
uint256 public depositB;
uint256 public timeout;
enum State { Opened, Closed }
State public state;

function openChannel() public {
userA = msg.sender;
userB = inputData.recipient;
depositA = inputData.amountA;
depositB = inputData.amountB;
timeout = now + inputData.duration;
state = State.Opened;
}
}
```