https://github.com/code-423n4/2024-08-axelar-network/blob/69c4f2c3fcefb1b8eb2129af9c3685a44ae5b6fe/axelar-amplifier/contracts/axelarnet-gateway/src/contract/execute.rs#L14-L15
A placeholder is being uses to substitute the tx hash, since cosmwasm doesnt provide it, now there is an open todo to get this from core. However, this has not been sorted in production code.
https://github.com/code-423n4/2024-08-axelar-network/blob/69c4f2c3fcefb1b8eb2129af9c3685a44ae5b6fe/axelar-amplifier/contracts/axelarnet-gateway/src/contract/execute.rs#L28-L32
Get the actual tx hash from core.
