# transaction(at:) Returns the transaction at the given index as an owned [`Transaction`](/documentation/BitcoinKernel/Transaction) (safe to store past this block’s lifetime). ``` func transaction(at index: Int) -> Transaction ``` ## Parameters `index` Zero-based transaction index. ## Discussion Index `0` is always the coinbase transaction. Non-coinbase transactions follow in block order (typically ascending fee rate for miner-assembled blocks, but this is convention — the consensus rules don’t require it). > Precondition: `index` must be in `0..