Can I read BitVMX: A CPU for Universal Computation on Bitcoin on EtoBox?

BitVMX: A CPU for Universal Computation on Bitcoin by Lerner, Sergio Demian; Amela, Ramon; Mishra, Shreemoy; Jonas, Martin; Cid-Fuentes, Javier Álvarez is a scholarly article available to read on EtoBox.

What is BitVMX: A CPU for Universal Computation on Bitcoin about?

BitVMX is a new design for a virtual CPU to optimistically execute arbitrary programs on Bitcoin based on a challenge response game introduced in BitVM. Similar to BitVM1 we create a general-purpose CPU to be verified in Bitcoin script. Our design supports common architectures, such as RISC-V or MIPS. Our main contribution to the state of the art is a design that uses hash chains of program traces, memory mapped registers, and a new challenge-response protocol. We present a new message linking protocol as a means to allow authenticated communication between the participants. This protocol emulates stateful smart contracts by sharing state between transactions. This provides a basis for our verification game which uses a graph of pre-signed transactions to support challenge-response interactions. In case of a dispute, the hash chain of program trace is used with selective pre-signed transactions to locate (via $n$-ary search) and then recover the precise nature of errors in the computation. Unlike BitVM1, our approach does not require the creation of Merkle trees for CPU instructions or memory words. Additionally, it does not rely on signature equivocations. These differences help a

Author

Lerner, Sergio Demian; Amela, Ramon; Mishra, Shreemoy; Jonas, Martin; Cid-Fuentes, Javier Álvarez

Published

2024

Language

EN