Do I qualify as a Bitcoin node?

Hey, folks. Just downloaded 600 GB of Bitcoin Core. So here's where I stand (I included a screenshot). Am I a node now? Do I need to tweak any settings? Since I chose the pruned node option, if I shut down my computer, will I need to download that 600 GB again? Do I have to keep my computer on all the time? What if I don’t run the program for a few days? Does it work automatically when connected to the internet?

As long as you're running Bitcoin Core, you're a node, even if it's not fully synced. You can safely turn off your computer after shutting it down properly. When you start it again, it’ll sync to the latest block. But yeah, it won’t start on its own, so keep it running if you want it to function as a node.

Thanks a ton! What’s the deal with the current number of transactions and the memory usage in the memory pool?

The memory pool holds unconfirmed transactions your node sees that haven't been included in a block yet. So, the number represents how many transactions are in that pool, and memory usage shows how much memory is used to store them.

Got it, thanks! Another question. Should I be using port 8333? Not sure what my current port is... Why does that node map site not show anything in my country? I tried checking my node there and got this error: (My IP: 8333 is unreachable). Does that mean I’m not a node?

Nope, you're definitely a node. Nodes connect to others and let others connect to them. If you haven't forwarded port 8333, then Bitcoin Core can’t allow incoming connections, but you can still connect out to others. It's not a big deal for your functionality, but you’d benefit from letting others connect.

Thanks again! If I keep using port 8333 and others connect to me, won't my internet security be at risk? I mean, what about my accounts on social media or wallets?

Nah, you're good. People can connect through port 8333, but Bitcoin Core is designed to only listen on that port. It doesn’t share sensitive data with anyone, so you shouldn't worry about it. The data shared is just transaction info, blocks, and peer details.

Thanks, you've really helped me today. I’ll reach out if I have more questions. Super grateful!

Just a heads up, Bitcoin Core uses port 8333 by default. You can change it, but honestly, there’s no strong reason to do so. Also, check out the homepage for more info. Scroll down to "Join the Network," input your IP/port, and hit "Check Node". If you haven't done that, it might take a while for the site to discover your node.

You can actually set it to start automatically. Go to Settings -> Options, and check "Start Bitcoin Core on system login" under the 'Main' tab. Then, in the 'Window' tab, you can minimize it to the tray instead of the taskbar.

There's a bit of debate about whether you're a Full Node without incoming traffic. I think not having any incoming traffic means you're not fully optimized, but how does that impact the consensus mechanism? Anyone?

You are a Full Node as long as you're validating consensus rules, regardless of incoming connections. The only difference is whether peers can connect to you, but it doesn’t change your node’s role.

Regardless of incoming connections, your node always verifies all blocks and transactions. Just a quick note for those using CGNAT; it won’t work for you.

To clarify, when we refer to being a node with incoming traffic on or off, @ACBbits @ranochigo, do I understand correctly that: a. A Full Node remains a Full Node without incoming traffic, b. Even in that case, it still supports network consensus?

You actually have some incoming traffic. Your node wouldn’t work without a little bit. You’re a Full Node since you validate all transactions and blocks. Usually, Full Nodes are the opposite of SPV nodes.

I never said point 'a'. There’s a difference between incoming connection and incoming traffic. Just for clarity, estimated total full nodes are around 70K, but only about 19.5K accept incoming connections.

+1! Totally agree with @ranochigo. The numbers show that opening port 8333 serves a purpose.