As far as I know, double-spending requires the ability to create alternative blocks that override or fork the main blockchain. This ability comes from mining power, not from running nodes. But maybe I'm wrong. And I'm not sure what you mean by "block and kind of delay transactions".

I randomly thought about this question earlier and I just had it to bring it here.

What could theoretically happen if a single person or group with malicious intent do by creating and owning over 50% of full & online Bitcoin nodes?

Could they potentially "eclipse attack" by hiding some blocks to other nodes or would simply using something like Bitnode which ranks nodes solve this problem? But I reckon the nodes in Bitnode could still refer malicious nodes to new nodes; unless I'm not informed properly on how Bitcoin's peer-to-peer network works.

Alright, I did some more waiting and I now have 3 inbound onion connections. Awesome.
I'll keep the topic open in case any Bitcoin Core savants want to add anything.

I reckon I'm delighted with my current setup, I'm using a Cold Card hardware wallet with Bitcoin Core's PSBT controls, for a fully air-gapped setup, with my own full node routed through Tor, helping the network 24/7.

I recently got my hands on a 5TB external HDD and I just finished moving over the blockchain and my torrents to it, it's quite practical, but I have an important concern.
Essentially, I can't forward port 8333 on my router, and I'm using a VPN anyway, so it'd pretty much be pointless, so I resorted to using a Tor hidden service to allow incoming connections to my node.

I followed the bitcoin.it guide to setup a node over Tor on Linux and got everything working, and then asked some AI to optimize my bitcoin.conf, and ended up with this :

But looking at my peer window in Qt after 30 minutes of my node running, there's only one inbound Onion connection, with some occasionally coming in but disappearing the next second.

I want to know if I can add/remove/change anything in my config to contribute more to the network.

This could be answered by a simple google search, but what does "BIP" mean? I want to know from someone on here to have a more specific answer.

Thank you, I'll take a look at that header file & those BIP links. I actually already have a full node so that's off the list. I might update my thread after making the changes. And thanks again for compiling those resources, much appreciated.

I'm not sure this has been asked before, apparently not, but in the peers tab of my Bitcoin node, I see a "services" tab. Can someone inform me on these? Second thing, if some services benefit the network, how do I tweak my node to offer those services to my peers?

Here's a screenshot of the services tab I'm talking about; I currently cannot attach images to posts as a newbie.

This might be a hot take, but to me, it really seems like the root of the spam, low quality or duplicate posts problem on the forum comes from the merit system. What was originally created to encourage the creation of high quality content has now turned into a way to attract spammers xD.

There's not many solutions I can think about for this & I'm not sure if this has been pointed out before but I've been lurking the forum a lot and I noticed there's countless threads made by relatively new members which seek to compile resources / forum rules, the thing is, by making a single search query, I found a ton of these kind of threads, not only made by new members, but established ones as well. This is definitely not a big issue, but I'm thinking it'd be cool to have a single, collaborative space where this information can be compiled, I see no point in having 300 different threads like that. I also don't understand why new or non established members feel the need to create those threads, when again, it's already been done countless times before. Anyways, I feel like I'm just going on a rant now, but I'm curious what other people have to say about this.

Hmm, I must've misunderstood you here.

Your arguments seem valid for the most part, but I won't lie, in the 2 years in which I've used my coldcard, I've never had any issues, and take the following statement with a grain of salt, but I'm ready to say, confidently, that it would be nearly impossible to clip a different address in a PSBT in which I am double, triple, quadruple checking the recipient address to make sure I'm sending my coins to the intended recipient, before signing the PSBT and broadcasting it.

I'm not sure where you got the information about the firmware being proprietary. It is not.
https://github.com/Coldcard/firmware
"To have confidence this source code tree is the same as the binary on your device, you can rebuild it from source and get exactly the same bytes."

And I don't see how them claiming their product to be fully air-gapped is deceitful, my mk4 has never touched a computer's USB ports / been connected to the internet, I use an SD card to transfer PSBTs back and forth.

Welp, I did not make further research but I'm actually very surprised Coinkite made their scanner source code proprietary, that's very odd.
As for the batteries, I agree, I think it would've been far more convenient to simply have a USB type-c rechargeable battery, but anyways, it's not that big of a deal.
The bulky size is also sort of annoying, the compact model of the mk4 makes it super convenient and easily concealable.

I also read everyone's reply and made the choice to simply stick with the mk4, my current setup is completely fine.
Thanks a bunch for summarizing that post for me Pmalek, much appreciated.

Hey guys, I've been using the ColdCard Mk4 (fully air gapped setup with full Bitcoin Core node, I know, I'm sort of a chad) for around 2 years and I recently saw CoinKite finally released their Q1 model, which comes with a QR scanner, full qwerty keyboard, and battery slots, which are some pretty awesome features to say the least, especially in the context of an air gapped setup.

I wanted to know if any of you guys use the Q1 and could provide some feedback.