Can blockchain steal our bitcoins?

[Curious8]

Is Blockchain.info safe  ? for 15 BTC +  ?

[pedrog]

Are you referring to blockchain.info?

If so, no, they can't.

[helloeverybody]

If your bitcoins are in your own wallet then they cant be stolen unless someone has your details/hacked your account. you should be fine.

[unholycactus]

Are you referring to blockchain.info?

If so, no, they can't.

If you use them for their wallet service they can and they don't need a reason.

If OP is talking about the actual blockchain:
Bitcoin is decentralized and if you're doing things correctly, only you can control your funds.

[DarkStar_]

Are you referring to blockchain.info?

If so, no, they can't.

They can easily feed you malicious javascript when you are logging in so your password goes to them instead of decrypting it in your browser.
So, yes, they could.

[DebitMe]

If your running a bitcoin casino, the best way to keep funds safe is to use cold storage wallets that are generated on a computer that is never connected to the internet.  If you google search, "Cold Storage" there will be many sites detailing how to make one.

[erikalui]

Are you referring to blockchain.info?

If so, no, they can't.

If you use them for their wallet service they can and they don't need a reason.

If OP is talking about the actual blockchain:
Bitcoin is decentralized and if you're doing things correctly, only you can control your funds.

How can they scam the users when we own the private keys of our wallet? There are thousands of users who use their online wallet and I've not seen users complaining about their wallets getting froze. Many have reported that they have lost access to their accounts due to loss of private keys.

[morantis]

Bear in mind that it is pretty easy to make what appears to be an online wallet service.  When the site generates the receiving addresses it can maintain control over them and simply transfer the whole lot to themselves when the time is right.  Stick with the ones that are well known.

[Zaun]

They can take your bitcoin since they own the private keys like you.
It is not likely to happen since they have become a respectable company these days.
Not some anonymous person from the east of europe for example.

[coinzat]

Your question is not clear .
The actual Blockchain has all bitcoin transactions that happened and will happen. Every one uses bitcoin core wallet has that blockchain on his computer. So block chain technology is very safe.

If you mean blockchain .info wallet , I'm using it without any problem. It is well known company and has a great reputation

[HarryKPeters]

They can, but i don't expect them to do that.

But, never keep too many coins with a third party. Bitcoin is made to be safe with your OWN local wallet. There is no need to only use third parties. In fact it is even dangerous.

[bitbaby]

Are you referring to blockchain.info?

If so, no, they can't.

They can easily feed you malicious javascript when you are logging in so your password goes to them instead of decrypting it in your browser.
So, yes, they could.

^This. They haven't until now (or maybe they have?) does not mean that it safe or that they can't/wont in future. If you must use blockchain.info's wallet then just use it for petty cash for day to day activities, if you use it for larger amount of funds then you're just asking to get robbed and it might happen one day.

[~Bitcoin~]

No if you are referring to blockchain.info they are safe and secure till now and i don't think they will steal in future too.
If you feel unsecure make cold storage address on blockchain.info and put all of the coins there, don't forget to print out the cold wallet paper you get there as .pdf file.

[pedrog]

Are you referring to blockchain.info?

If so, no, they can't.

They can easily feed you malicious javascript when you are logging in so your password goes to them instead of decrypting it in your browser.
So, yes, they could.

In that case, any wallet provider can do that, including Bitcoin Core.

[ab8989]

Are you referring to blockchain.info?

If so, no, they can't.

They can easily feed you malicious javascript when you are logging in so your password goes to them instead of decrypting it in your browser.
So, yes, they could.

In that case, any wallet provider can do that, including Bitcoin Core.

Yes. However there is an additional question.
Can they get away with it with nobody being able to prove they did it and have 1000 users even proving that they did not do it?
And is it possible that only one possibly some shop floor level server operator can do the stealing with nobody else even some higher up from the company knowing about the theft and who did it.

For an online wallet the answer is yes, trivially.
All they need to do is for one time feed the malicious javascript to one user only which they have selected to be the one they want to steal from. The probability that everybody inspects their javascript EVERY TIME they use the online wallet is just ridiculous.
Clean up the server and nobody knows what happened with no proof available to anybody and blame a keylogger in the victims computer.
Have 1000 users inspecting THEIR javascript to "prove" that the javacsript from the company is safe with no backdoors.
Has that happened already? You betcha.

For bitcoin core the answer is no.
The proof about the malicious code remains out there forever and traces about who put it in there.

[HarryKPeters]

Are you referring to blockchain.info?

If so, no, they can't.

They can easily feed you malicious javascript when you are logging in so your password goes to them instead of decrypting it in your browser.
So, yes, they could.

In that case, any wallet provider can do that, including Bitcoin Core.

With bitcon core it would be very hard. So many geeks are using those wallets, scanning them etc. etc. theyr suprise back door or virus will be hot news within a few hours.
Blockchain.info is 'watched' by far less many geeks. But I don't expect them to do something like that.

However, i never hold more then 1 BTC with either blockchain or coinbase.

[Amph]

there were some holes in the past but many of them are fixed, now, what can really steal your coins is a infected computer, nothing else

so remember that when your coins has been stolen, it was 100% your fault if use a local wallet, and let's say 50/50 if you use a web wallet...

[robelneo]

I doubt if they can do that you own the key to that  it goes up on how you manage that properly I have read that many people lost their bitcoin but not because of blockchain but because of their negligence you can do a cold storage if you want to really keep your bitcoin in a very safe place

[notaek]

Can blockchain steal our bitcoins?

If you are asking about Bitcoin's general "block chain", then you don't need to worry about anything because, a block chain is a transaction database shared by all nodes participating in a system based on the Bitcoin protocol. A full copy of a currency's block chain contains every transaction ever executed in the currency for it's decentralized outlook. You can view the live block chain here.

In case you're asking about Blockchain website, then I would advise you to check the various ways to access your wallet there and the security characteristics associated with each types.

For running bitcoin casino for example, what is the best way to keep your funds safe?

In this case, you can chose your preferred wallet after studying the various security measures it can enhance while keeping your funds safe.

One pro-tip for running a Bitcoin casino; use two different wallets, one as a cold wallet for reserving 70-75% of your bankroll and another one as a hot wallet for running your games.

[pedrog]

Are you referring to blockchain.info?

If so, no, they can't.

They can easily feed you malicious javascript when you are logging in so your password goes to them instead of decrypting it in your browser.
So, yes, they could.

In that case, any wallet provider can do that, including Bitcoin Core.

Yes. However there is an additional question.
Can they get away with it with nobody being able to prove they did it and have 1000 users even proving that they did not do it?
And is it possible that only one possibly some shop floor level server operator can do the stealing with nobody else even some higher up from the company knowing about the theft and who did it.

For an online wallet the answer is yes, trivially.
All they need to do is for one time feed the malicious javascript to one user only which they have selected to be the one they want to steal from. The probability that everybody inspects their javascript EVERY TIME they use the online wallet is just ridiculous.
Clean up the server and nobody knows what happened with no proof available to anybody and blame a keylogger in the victims computer.
Have 1000 users inspecting THEIR javascript to "prove" that the javacsript from the company is safe with no backdoors.
Has that happened already? You betcha.

For bitcoin core the answer is no.
The proof about the malicious code remains out there forever and traces about who put it in there.

Again, in that case any wallet can be used, including Bitcoin Core.