add credit to cosmwasm

Author: colmazia

packages/vm/src/checksum.rs

@@ -4,6 +4,8 @@ use sha2::{Digest, Sha256};
 
 use crate::Error;
 
+/// This is a copy of checksum.rs from https://github.com/CosmWasm/cosmwasm/blob/6082e8a35a193f1365cb3367f77bd87c593a7ae4/packages/vm/src/checksum.rs
+/// 
 /// A SHA-256 checksum of a Wasm blob, used to identify a Wasm code.
 /// This must remain stable since this checksum is stored in the blockchain state.
 ///