user24926: I'm trying to understand how my node would interperet a SegWit transaction if I do not upgrade.                                                                

Even if I do not upgrade, I should be receiving the exact same block data as everyone else, correct?                                                        

If so, let's say my node receives a block that contains a segwit transaction (i.e. one with a [marker][flag] and some [witness] data). I'm not sure how my node is going to interpret the data...                                                                                                                            

If the [marker][flag] is [00][01], does my node read this as being 0 inputs and 1 output, and still consider this transaction valid?                        
If so, how can it go about recreating the TXID from the [version][txins][txouts][locktime] if the transaction data is of the format [version][marker][flag][txins][txouts][witness][locktime]?                                                                                                                    

Basically, I don't understand how my node could receive transactions with [witness] data and still consider those blocks to be valid.

user12983: Segwit node will convert transactions and blocks "on-the-fly" while sending them to your non-upgraded node. You will see anyone-can-spend outputs and redeems from such outputs. You will not see any additional flags, witness data and any other segwit stuff.

24926: <p>I'm trying to understand how my node would interperet a <em>SegWit</em> transaction if I do not upgrade.                                                                </p>

<ol>
<li>Even if I do not upgrade, I should be receiving the exact same block data as everyone else, correct?                                                        </li>
</ol>

<p>If so, let's say my node receives a block that contains a segwit transaction (i.e. one with a <code>[marker][flag]</code> and some <code>[witness]</code> data). I'm not sure how my node is going to interpret the data...                                                                                                                            </p>

<ol start="2">
<li>If the <code>[marker][flag]</code> is <code>[00][01]</code>, does my node read this as being 0 inputs and 1 output, and still consider this transaction valid?                        </li>
<li>If so, how can it go about recreating the <strong>TXID</strong> from the <code>[version][txins][txouts][locktime]</code> if the transaction data is of the format <code>[version][marker][flag][txins][txouts][witness][locktime]</code>?                                                                                                                    </li>
</ol>

<p><strong>Basically, I don't understand how my node could receive transactions with <code>[witness]</code> data and still consider those blocks to be valid.</strong></p>
 12983: <p>Segwit node will convert transactions and blocks "on-the-fly" while sending them to your non-upgraded node. You will see anyone-can-spend outputs and redeems from such outputs. You will not see any additional flags, witness data and any other segwit stuff.</p>
