LNHANCE bips and implementation

cryptoquick · March 15, 2024, 7:14pm

Hi, I’ve made a modified version of rust-bitcoin-script that can do an implementation of LN symmetry script, so anything that needs the bytes for script somewhere can easily get the right format.

github.com

cryptoquick/rust-bitcoin-script/blob/1a7e1742b3a699fa5a021a73211e36d92a2c3bd5/tests/test.rs#L26-L44


      
          #[test]
          fn lnhance() {
              let s = hex::decode("a2f0e0d0c0b0a0908070605040302010").unwrap();
          
              let script = bitcoin_script! {
                  OP_CHECKTEMPLATEVERIFY
                  0x0102030405060708090a0b0c0d0e0f2a
                  OP_CHECKSIGFROMSTACKVERIFY
                  <s>
                  OP_CLTV
              };
          
              assert_eq!(
                  script.to_hex(),
                  "b3100102030405060708090a0b0c0d0e0f2ab410a2f0e0d0c0b0a0908070605040302010b1"
              );
          }

Forgive me if my byte counts are off in the example, I wasn’t sure of the exact inputs.

I don’t yet have support for IK, but I think that’s a Taproot thing anyway, so not the same as script.

Thanks to @cguida for nudging me towards doing this. He’ll be using this or something like it in trying to make an LNHANCE CLN plugin.