You can say its hackable because its on Internet, but it isn't easy to hack bitcoin otherwise by now, all the big hackers would have been quite rich and people would stop using bitcoin much due to its vulnerability.
It is hackable, but one can take some precautions or some steps to make it secure.  

Source??? Google is your friend, I have given all you need above, if you just google.

"Google is NSA" - Putin.


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Give me an address, and I will hack it, it can be done, that's what LBC is all about, this is what EDCSA-sorting is all about, and bloom-filters. It can be done. It's just not done where it attracts attention.

51% has to do with adding a transaction to a block-chain, and once a new transaction has 51% consensus it stays and the longest blockchain wins the battle on the de-centralized network.

This HAS NOTHING to do with security, SATOSHI created "51%" to solve the double spending problem.

Now security, which is what we're talking here, is that there is a KEY, a private key and a public key, your address is public, and if I KNOW your Private KEY then YOUR Money is MINE.

Now that question to be asked about "HACKING BTC", is HOW do I get YOUR BTC private key?

Well it can be done, and above I explained how its done, and if you google, you can learn.

On the question of infinite time and hash-power that's not true, while true on 'brute force' ( dumb search ), a sophisticated sorted butter-fly algo can drop the search space to 2**32, current 'infinite bullshit' is 2**50, or 2**128, but advanced researchers who study EDCSA see patterns and figure out algos to reduce the search space to 2**32 or less, and then it can be done in short-time computationally.

The problem as shown on this topic and OP, is that the majority here don't have a clue about BTC or how it really works.

The OP asked a good question, but the normal BOTS&TROLLS stepped forward with the normal canned bullshit, sure in a world of MORONS BTC can't be broken, that was the idea behind "Brain Wallet", and all the lemmings that followed that moron lost their BTC.

Just a few years ago RSA with 128 bits was impossible to break, but then one day a guy discovered they were seeding with ports which were 2**10, which meant that if you search a small seed-space you could break the CRYPTO in a few minutes to this day BANKS still use RSA, which is well understood how to hack.

Same with BTC ( sha256 ), smart people study patterns and figure out how to reduce the search space so that a crypto-puzzle can be quickly solved.

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All of this is BULLSHIT really because anytime BTC wishes they can move from SHA-256 to SHA-1024 and make BTC impossible to break, IMHO the ASSHOLE hold BTC back to SHA256, because the ASSHOLES want to be able Steal "asset forfeiture" as they wish, just like they do now with banks.

Ergo if BTC doesn't get off its ass, then the zcoin ( zencash ), ... will be where the crypto-anarchy people go, and BTC will be for assholes & morons.

Yes, almost all the threads in Meta are enough proofs to say that bitcoins are hackable. More or so, there are lot of scammers too. New accounts seems to find ways to gain faster nowadays by hacking and scamming bitcoin users here. Old members seem to trust services because of past experiences that are smoothly done. But in my opinion, all must be very careful now. Scammers and hackers are everywhere.

To me things based on internet are hackable.no matter how strick security you provide it is still on some risk.

Yes, there is a high possibility that a hacker will hack bitcoin if it’s not that safe. But, the good thing about bitcoin is it is secured, so it will be more difficult to hack. This is what I think.

“Bitcoin itself, and most of the other cryptocurrencies, have never been hacked or even really had any downtime,” said Chris Wilmer, an assistant professor at the University of Pittsburgh and the founder of Ledger, an academic journal covering the blockchain technology at the heart of Bitcoin.
There is one type of attack that could affect the bitcoin network: the 51 percent attack, which is widely considered to be bitcoin’s greatest inherent flaw. Because it is decentralized, bitcoin is vulnerable if any one player or cartel gains control of 51 percent of the computing power of all miners. This would allow them to stop transactions and reverse transactions, which would throw the network into chaos. In the past, at least one group has achieved control of 50 percent of the network. However, the more people using bitcoin, the safer it is — and more people are using bitcoin now than ever. It’s difficult to get an accurate count of how many users bitcoin has, but the estimates are in the millions.
Where Bitcoin becomes truly insecure is when other technology starts to get involved. Bitcoin was conceived as a “trustless” system; you don’t have to trust any centralized party in order to use your money, because transactions are facilitated by other members of the network. In reality, bitcoin is too complicated for most people to use without mediators such as apps, wallets, and other digital currency services. The biggest need is for third party exchanges, which are sites where bitcoin is bought and sold for other currencies. All these third party services are only as safe as their own security. Mt. Gox, arguably the most famous example of an exchange going belly up, filed for bankruptcy in early 2014 after around 850,000 bitcoins went missing.
Bitcoin is still largely unregulated, which means your money isn’t insured and there is often no accountability for exchanges. So while bitcoin tech itself remains unhacked, the methods used to collect, buy, and sell remain as potential attack vectors.
The biggest threat to Bitcoin, then?
“It’s people,” said Simon Bain, CEO of BOHH Labs, a cybersecurity startup focused on banking. “It’s always been people, and it always will be people. There are good people, and there are not-so-good people, and those not-so-good people want to grab hold of your information. If you leave that information in the hands of let’s say, seven miners, then at some point those not-so-good people are going to go to one of those miners, and that miner is going to be exploited — whether they know it or not.”

Based on my own opinion all internet related programs or applications or even sites are hackable but  for me bitcoin is very difficult to hack.

Everything on the internet is hackable, but the question is , will it be easy, I am sure bitcoin should be hackable but wont be that easy.. Minor hacks like targeting a person and stealing his private keys should be the easiest but hacking the network .. thats a story for another time

yes all things on internet is hackable, from website, account, bitcoin, and many other. but until right now i never hear that hacker can hack bitcoin and send all bitcoin into their account, because in bitcoin we use blockchain platform, i hear that blockchain platform is like a gate, every 10 minutes a new gate is created, so hacker need 10 minutes for hack our bitcoin if they fail a new gate is created after a previous gate