def is_next_block_in_chain(height, v):
	''' Returns true if the prev_hash of the block in v matches the hash of block with height-1'''
        if (height == 0):
            return True
	(blkhash, block_version, prev_hash, root, timestamp, target, nonce, txs), blk_size = load_block(v)
	actual_prev_hash = db.execute('SELECT hash FROM block WHERE height=?', (height - 1,)).fetchone()[0]
	return b2lx(prev_hash) == b2lx(actual_prev_hash)