In Fuel, a type called b256 represents hashes and holds a 256-bit value. The Rust SDK represents b256 as Bits256(value) where value is a [u8; 32]. If your contract method takes a b256 as input, you must pass a Bits256([u8; 32]) when calling it from the SDK.
Here's an example:
If you have a hexadecimal value as a string and wish to convert it to Bits256, you may do so with from_hex_str:
Was this page helpful?