You don't get the problem. And you didn't read my post well.
YOU DON'T KNOW WHAT IS FLASHED ON A HARDWARE WALLET WHEN YOU BUY IT, NOR YOU DO KNOW WHAT CODE HAS BEEN COMPILED INTO AN APP WHEN YOU DOWNLOAD IT.
I hope this is clear now.

Neither you can ask the mainstream users to learn coding, flashing hardware, etc.
This is a main point of failure in the Bitcoin system.

Same goes for apps on Google Play: I developed few things for Android in the past.
I could just compile and upload. Voilá: downloadable.
I guess this goes for ANY app. Google can't check thousands of apps submitted every day.
So my scenario is perfectly possible, and again, this is a point of failure that should be looked into... before it's going to happen, I guess.

Now, of course there's no way to be 100% sure about the software or hardware one is using, unless he checks and compiles it himself.
But on the other side, I think there SHOULD be a way to make things more transparent in this regard, or sooner or later some huge amount of value will be stolen this way.
I didn't think deeply into it, but probably wallet developers, starting with the Bitcoin Wallet developers, should put in the works a system to allow people from all the world to check the code RIGHT BEFORE it gets compiled and uploaded to Google Play.
Having the code available is not enough, imo, for the reasons I explained before.
What people must be sure of, is that the Wallet hitting Google Play is safe. The availability of the code as open source doesn't grant anything, apart the option to start a new wallet from that code for free.

So you didn't read my post throughfully.

But this set apart, what would you do if your house would burn? You would lose the house AND all your BTCs.

And if somebody comes and steal your PC with your hardware wallet plugged in? Wouldn't it be fun? XD

Why you say that it's all about trust?
I don't think it is.
MtGox and more examples showed us you can't trust. But I didn't even need those examples. Money is money, and Bitcoin is money.
And humans are still humans. I can't see why you should trust more the Bitcoin scene developers than any other financial institution.
The fact that most Bitcoin people are dreamers hoping in a more free world doesn't mean that robbers won't get into the scene.
Quite the opposite: as it's a pioneers ground, criminals have better land to work.
And even non-criminals could always go down on temptation.
Dreaming is nice, but with money you better keep your eyes open (and your ass well shut! XD)

While I agree that banks are the problem, you can't go over the fact that your money are protected in there. If the bank gets robbed, there's no repercussion on your money, they are insured, you will get your money, no matter what. Of course this doesn't include huge bank problems and the bail in shit. But a group of robbers entering a bank won't affect your funds.

But your BTCs at home are unprotected. You can't insure them, because no insurance is accepting it, at least for now. You have to provide your own funds safety.

Trezor is open source, and you have the code available, BUT when you buy one, you don't know what is flashed in it.
You don't know if the software flashed in it, on 11.11.2021 anybody connecting a Trezor to internet will see his BTCs flying away.

Also, you can't ask to all people to become programmers. That's not a viable way to spread Bitcoin into mainstream. Even most coders wouldn't waste time on checking all the wallets' code.

You can't even ask people to compile the code themselves. I mean, I could do it, I am somewhat of a programmer myself, but it's really an annoying waste of time and I should be sure that somebody checked the code from Github before I compiled it, as I am not able.

So, apart raising the problem with this thread, I would like to receive a concrete answer.
At the moment, I think there's no grant anywhere that what you use as a wallet is exempt from the safety problems I exposed.
You download a wallet and you can't know what's in it.
But a larger team, means also more difficulty to put malicious code in the final version that is uploaded to a store.
In this regard I guess the Bitcoin Wallet, the official one, is probably the most reliable under this point of view.
Is there any expert in the wallets scene around here?

Some people don't catch all of this. They just see an opportunity to steal, and they will do. MtGox didn't teach you anything?
Read my text again, it's very clear.
You COULD do it.
A single person is enough to create a wallet.
A single person is enough to put up a system like I described, compile, upload to the Store, take the money and run away.
If that person gets like 1000 BTC, that's more than enough in some countries to live without working a single day more in his life.
You probably couldn't easily identify who is the person. Or that person could also go live in a country without extradition.

And this is only ONE possible scenario.

How do I know that a wallet is not secretly sending my seed to the developers?

How can I be sure that the compiled code in Trezor is the same that is published online?

Thank you for your suggestions!

Thank you for the effort, but it doesn't seem you know what you are talking about.
Let me be clear, I am on Bitcoin since 2013 and know a bit about it. I also wrote some articles on CoinTelegraph and a book about it.
But on the technical side I didn't dig deep into programming and security.
But I am also a little bit of a programmer, so I know something about it, that you seem to not be aware of.
Then let me explain: if tomorrow I make a wallet app, let's call it GODLIKE WALLET, and then I put it on the Google Store, anybody can download it.
I can make it open source: you could see the code on Github and check that there's no backdoor or any trick to allow me, the developer, steal your funds.
I could run loyally for some time, wait until its adoption becomes large, let's say 50000 installed clients.
THEN, I could make a new build, with a piece of code to send all the Bitcoins in the wallet to an address, and upload it to the Google Store.
People would update it, and as soon as they would launch it, all their funds would be transferred to my address.
The code on Github wouldn't be updated, people would trust it, and even if for just few hours, the compromised wallet would be live on the Google Store, stealing all funds from thousands of clients.
I would probably receive hundreds of Bitcoins.
I would then move those funds to some altcoin with anonymous transactions, and immediately reconvert those altcoin funds into Bitcoin.
There, the robbery is served.
But I don't know if this a realistic scenario, because I acknowledge that my know how doesn't get so deep into the mechanism, so I'm here asking this purely technical question about wallet apps and hardware.
I'm asking if there's a way to be sure about the purity of a wallet from the developers side, when one installs it or buy a hardware one.

I know there are many threads about the BEST Bitcoin wallet, but I don't think that's the right question to ask.
There's no best, but only the one that fits better one's needs.

What I'm looking for, is the best way to protect my BTCs.
What bothers me is the fear that some of the developers could slip a backdoor or a mechanism to steal all the Bitcoins from all the wallets one day.
I know this may look an absurd fear, but still, I don't think it can't be ruled out.
I'm also just out of reading about a bug in the CoPay wallet where using a multisig transaction one could steal all the coins in a wallet, due to a bug. Don't know how old that article was though.

However, the problem is that with banks, our savings are protected: if robbers steal the bank, they have insurance, you always can get your money... at least until the government wants to fuck you up and lock your account, of course.
But in normal conditions, you don't have to think about your savings safety: they are there, you forget about them and no problem about robbery.

With Bitcoin, you are your own bank.
This means that YOU have to make sure your savings are... safe.

Now, a phone app would be ok for me. I could print the seed words and put the paper in my father's strongbox.
But as I wrote here up, I am scared by developers themselves.
I know that most wallets are open source, and anybody can check the code, but still I don't know WHO or IF the code of wallets has been really checked by anybody.
I myself surely can't check it.
My programming skills are very basic and I don't know enough of blockchain functioning to check anything, and I guess the same goes for 99999 people on 100000 on the planet.

So my question is: what is the most secure wallet out there? I suspect it's the Bitcoin Wallet from the Bitcoin Wallet Developers, right?
Still, how can we be sure they are not going to group up and fuck up everything when Bitcoin price will go up?

This in regard to the Bitcoin Wallet.
Switching to "third party" wallets, we have more problems: even though the developers make the code open source, how can I know that they won't one day upload a completely different version to the Store and get my money? Is this a realistic possibility?

With hardware wallets, the problem persists and becomes even worse. Of course hardware wallets can't be open source (I think), so nobody can check what they really do and what's really running in their chip.

Well, I think I made my point clear.
Hope somebody can help me up in choosing the most secure wallet out there.
Thank you in advance!

Dai poveretto... capiamolo... a una certa età cose rivoluzionarie come Bitcoin sono difficili da accettare.

Thank you!

Here it says it's up: http://www.downforeveryoneorjustme.com/poloniex.com

Worked for me up to few minutes ago, now seems offline.
Wonder why they don't fucking give warnings before taking down the site for updates.
And if they've been hacked, this is the last time I will ever use an online exchange.

OpenBazaar is not a shop, it's a platform where anybody can open a shop.
So it depends on where you are buying, where they are available to send the stuff.

It's funny: until it was on the testnet I could reach shops, now it stops on scanning network and gives me no results.
Seems to me this is still an alpha version.
Wouldn't number it 1.0 but 0.9 or something.

But it should be working, because I see news like these: http://www.financemagnates.com/cryptocurrency/education-center-2/went-shopping-drugs-fake-ids-guns-using-bitcoin-openbazaar/
Any idea?

Thank you! Stop spying me now!   

OK thank you dudes 

I just made this transaction almost 2 hours ago: https://blockchain.info/tx/8f4d994f4df6e5b1c2180c1f3fd69af30a71bf714d84d023a7755e2ac6f7dd41

Says it's high priority, but despite this, it's still not confirmed, 0 confirmations.

Are the fees too low???

If you haven't got a statistical mind, trading in altcoins and Bitcoin is essentially gambling.
I am trading in this environment, and I "win" on something like 80% of my actions.
But many times I wonder what the hell people think when they are selling or buying at the wrong moment... clearly, I can see something that they can't see.