abstract fun getBlockHash(number: Long): Bytes32 (source)
Get block hash function.
This function is used by a VM to query the hash of the header of the given block. If the information about the requested block is not available, then this is signalled by returning zeroed bytes.
Return
The block hash or zeroed bytes if the information about the block is not available.
abstract fun getBlockHash(): Bytes32 (source)