Entrypoint

Every guest program must opt out of the standard Rust runtime and declare its entry point. Without it, the zkVM has no function to execute.

entrypoint!

Registers a function as the zkVM entry point and opts the crate out of the standard Rust runtime. The #![no_main] crate attribute is also required — the zkVM has no OS to provide a default runtime or main symbol.

ziskos::entrypoint!(fn_name)

Parameters

Name	Type	Description
fn_name	identifier	Name of the function to register as the guest entry point. Must have signature fn() -> ().

Example

#![no_main]
ziskos::entrypoint!(main);

fn main() {
    // guest code runs here
}

note

The #![no_main] attribute is required at the crate root. Without it, the Rust compiler generates a default main function that conflicts with the #[no_mangle] main the macro produces, causing a linker error.