Function query_state_exclusive_block 

pub fn query_state_exclusive_block(
    tx: &Transaction<'_>,
    contract_ca: &ContentAddress,
    key: &Key,
    block_address: &ContentAddress,
) -> Result<Option<Value>, QueryError>

Query for the most recent version value of a key in a contracts state that was set before the given block number.

This is exclusive of the block’s state (..block_address).