Those were required due to massive (network-breaking) bugs in Bitcoin itself, not because people put their money into an insecure third-party application which then was exploited to send said money to the attacker. The latter has happened many, many times in Bitcoin and nobody has ever seriously suggested a hardfork or rolling back the attacker's transactions, because Bitcoin developers, miners, and users all know that it would completely destroy everybody else's faith in the system. One must ask why those involved in Ethereum don't seem to know that.

Because there are rumours that it will be "fixed" by rolling back Ethereum's blockchain, which would be Very Bad.

It's only until he rolls back the chain, then it'll be us bitcoin holders' turn to start panicking.

This: https://web.archive.org/web/20150810141857/http://bitcoinmoney.com/post/53207712103/your-bitcoins-are-not-safe-at-alt-coin-exchanges

Shit, meet fan.

There's no "the" mempool. Every node has its own individual mempool, and its own policy on how many and which transactions to store and for how long.

Yeah, the lack of a liquid vanilla options market for bitcoins is, I think, the main thing holding back mainstream investment at the moment.

The wallet.dat file stores (among other metadata) the actual time each transaction was made, and this metadata will naturally not be present for transactions made after the backup (discovered during a rescan of the blockchain). For such transactions, the time displayed will be the timestamp of the block it was included in, which will generally be several minutes later.

I just assumed that, like hodling, whiskey was involved in the spelling.

Misleading advice from a sig spammer, who'd have guessed?

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No. Coins mined before the fork can be spent on both chains (which, incidentally, allows double-spending, which is one of the main reasons why anyone who knows anything is totally opposed to hard forks except where absolutely necessary). Coins mined after the fork are only can only be spent on the chain on which they were mined.

Yes.

As long as coins are not double-spent as explained above, you can spend coins from either wallet.

What are you even talking about? MultiBit HD, like any wallet, can send and receive bitcoins to and from any company or individual in the world who accepts bitcoins. What do you see when you click the Send/Request tab? When you have bought bitcoins on an exchange, you can request that they send those coins to your wallet. If you have coins in your wallet that you want to sell, you can send them to the exchange in order to do so. It's not that hard.

They say it's a place to buy and sell bitcoins, and that they particularly recommend it because they have a business relationship with them. You can, in fact, transact with companies other than those recommended by your wallet provider. For buying and selling bitcoins in Australia, I personally recommend BTC Markets (again, my recommendation is worth just as little as anyone else's).

Wow, that's a lot sooner than I thought. I figured on the start of 2017 at the earliest. If we do hit US$5000 on or before 30 September 2016, I'll give you BTC1. After all, I'll be a lot richer!

There is no need to ask "What is X?! Can you explain to me what X is?!" when there is a Wikipedia article about X which is also one of the first results if you just Google X.

A constructive post is one that constructs a point of discussion, such as a thoughtful question, a useful answer to such a question, an argument in a debate, or an interesting opinion. The length of the post is immaterial, as it's possible for a even a single word to be constructive, while an essay-length babble of useless or off-topic non-information is not constructive. Posts such as "I like this", "This is good", "+1", without actual information to justify those opinions, are especially non-constructive and are deleted on sight, and the posters will be banned if they persist in making such useless posts.

They can't. Only prepaid debit cards. Credit cards and debit cards linked to a bank account cannot be accessed. Why would you expect the truth (or anything close to it) from bitcoin.com?

Wrong. Transactions are stored in a node's memory pool for 72 hours by default, though some nodes are configured to keep mempool transaction indefinitely. In any case, a transaction will simply return to the mempool if it is still being broadcast (as transactions usually are until they are confirmed).

There is no maximum imposed by the Bitcoin protocol, but since the computers on which it runs are made of matter, the laws of physics impose an upper bound on the length of time they can exist. Your transactions will certainly cease to exist within 10⁴⁰ years when all atomic particles break down, unless the universe (or at least the Bitcoin network) is destroyed some other way before then.

You read wrong. Most software will continue to broadcast your transactions until they are confirmed with no easy way to stop it.

What fee (if any) was paid on these transactions? If no fees were paid, you may be waiting a while longer. Use the time to complain about the software or service used to create the transactions, since it is clearly defective.

That's because it only ever applied to free transactions, which miners are indeed moving away from. Core still prioritises free transactions this way when mining, but you need to change the default settings to allow free transactions in the first place. Most miners don't, but since some do, this is what determines whether a particular free transaction will take several days to be confirmed or never. It's probably better to just pay the recommended fee than to rely on this behaviour, though.

Wait, I was supposed to come up with a fake name? I wish someone told me that earlier.

Opportunities in the plural? In less than two minutes? Exactly how long does it take you to take advantage of each opportunity? They have medication for that, you know.