Johan Torås Halseth [ARCHIVE] on Nostr: 📅 Original date posted:2023-09-29 🗒️ Summary of this message: The author has ...

📅 Original date posted:2023-09-29
🗒️ Summary of this message: The author has implemented the MATT challenge protocol in Bitcoin Script and provides a detailed description and instructions on how to run the code. They propose using OP_CHECKCONTRACTVERIFY and OP_CAT opcodes to trace program execution and challenge computations. The next steps involve creating a generic framework for compiling high-level programs into MATT-compatible Bitcoin Scripts.
📝 Original message:
Hi, all!

I've been working on an implementation of the original MATT challenge
protocol[0], with a detailed description of how we go from a
"high-level arbitrary program" to something that can be verified
on-chain in Bitcoin Script.

You can find the write-up here, which also includes instructions of
how to run the code and inspect the transactions using a local block
explorer: https://github.com/halseth/mattlab/blob/main/docs/challenge.md

TLDR; Using the proposed opcode OP_CHECKCONTRACTVERIFY and OP_CAT, we
show to trace execution of the program `multiply` [1] and challenge
this computation in O(n logn) on-chain transactions:

func multiply(x int) int {
i := 0
while {
if i < 8 {
x = x + x
i = i + 1
} else {
break
}
}
return x
}

Next steps would be to make this a generic framework with tools to
automatically compile arbitrary high-level programs down to
MATT-compatible Bitcoin Scripts.

All feedback appreciated!

- Johan

[0] https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2022-November/021182.html
[1] https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2022-November/021205.html