Parameters:
height: Integer representing the height of the block.
Return value: Array (possibly empty) of strings containing a hexadecimal-encoded hash of a block header.
The JSON-RPC client must find the blocks (zero, one, or more) whose height is the one passed as parameter. If the height is inferior or equal to the finalized block height, then only finalized blocks must be fetched and returned.
It returns an array of hexadecimal-encoded hashes corresponding to the blocks of this height that are known to the node.
If the height is inferior or equal to the finalized block height, the array must contain exactly one entry. Furthermore, calling this function multiple times with the same height inferior or equal to the finalized block height must always return the same result.