Keccak256 Hash creation

You need to copy the bridge.teal file into sandbox using ./sandbox copyTo bridge.teal Sandbox uses docker containers and so files need to be copied there.

That error message isn’t great but it usually means that when you try to compile the program, the compiler cant figure out which subroutine to assign scratch slots to. This often happens when you try to use a MaybeValue directly as you have here with AssetHolding.balance. Try something like: Seq(…