I frankly don't know. Jim is the developer of Multibit. He must know.

I'm still interested on why this happened. This transaction is old, and when I first checked it on blockchain.info, it showed the correct date then.

I was looking at some transactions in my address, and found this:
https://blockchain.info/es/tx/cf77c2b888916c0debfb801d3d129ba5b7f6445e0dd6db9238b313b51369024c

Just look at the date of the transaction: 2063-08-04 05:00:33

Why is it in the future? Is this some sort of Y2K-like bug? Is it just in blockchain.info?

As far as I remember, I already have that money (but it was from those “free BTC” sites, so I wouldn't mind if it was invalid).

This is all related to how change works:
https://en.bitcoin.it/wiki/Change

Basically, if you received BTC0.50, and then you try to send BTC0.20, you are actually sending the whole:

• BTC0.20 to whoever you are sending
• BTC0.30 to yourself as change

Since this is a transaction and it needs to be confirmed (approx. 10 minutes), then you need to wait to be able to spend your money again.

It will take up to 15 minutes to retrieve the latest transactions, but besides that, yes, they are interchangeable.

Remember that people here are busy with their lifes. They come here and help, but they can't be here 24/7. Please stop being rude.

If you have your keys stored in your USB stick, then you can just insert it and ask Multibit to open it.

No. The wallet stores your private keys. As I said, if you generate 1000 keys and then you make a backup then you don't have to worry until you decide to create more keys.
All your bitcoins are stored in the blockchain, so you won't lose them if you have a backup from today and then you receive bitcoins tomorrow (in one the addresses you already have).

A paper wallet stores your public and private key, but it's and advanced feature, and very easy to mess up with. If you plan to use paper wallets you should consider using a program other than Multibit. Multibit is meant to be simple and straightforward.

If both your hard drive and your USB die, then you can't retrieve your wallet. It's your responsiblity to keep a backup, at least until Multibit HD is released (which then you will only need to remember 12 words and you will be able to recover it).

This date is the one of the first transaction in your addresses. What you've seen in other posts is that if Multibit is behaving weird, then you should reset the blockchain (it's an option in the menus, I don't remember exactly where). It will ask you for the date, and then you enter 1 or 2 days before your first transaction.

First of all, Multibit doesn't use wallet.dat. It uses a different format called multibit.wallet.

To do a backup, you copy this file and save it where you most like (preferably an offline device). You don't need to import/export keys, as that's a more advanced function.

Also, in Multibit, you only need a new backup when you generate a new address. I suggest you generate many (100 or more, depending on how frequently you receive money), and then do a backup of that. That way you won't have to worry to make more backups (at least for a long time).

There's no such thing as “moving bitcoins”. You have some private keys. If you import them in a new wallet, that means it will have access to those bitcoins (but they never actually moved).

Yo sólo le he contado a mi familia y a algunos amigos, y usualmente menciono la parte de la criptografía. No entro mucho en detalle, pero es bueno mencionarlo porque muchos preguntan “¿Y de dónde obtiene el valor?”, y yo creo (y espero que muchos estén de acuerdo) que el valor viene de que gracias a la criptografía se puede garantizar que lo que tienes es tuyo y no te lo pueden hackear.

Un poco aparte, pero vi tu sitio, y ya me suscribí. Espero que ofrezcan un buen servicio .

Going to enumbered.com gives me this:

Should I continue?

As far as I know, BitPlastic is a scam. Here in the forums I haven't read any single good review of them. You could try at your own risk.

Since currently keys are generated randomly, the only way to generate the same address would be to have it stored somewhere. It gets saved on multibit.wallet, but if it was saved somewhere else, it would be dangerous because the key could be stolen without the user even knowing it was stored there in the first place. HD wallets fix this as they are not random (they have a random seed, but it's the same seed for all new addresses).

I thought this was Bitcoin, not Dogecoin :O

You may as well wait for years, if you don't say what benefits would this new coin offer. People here are tired that every week someone creates new altcoins that will most probably die the week after.

I just don't see how this site can be useful. People don't browse the web and say “I know, I will visit a site made of a bunch of ads”. Ads are usually found on other sites, preferably with content related to the article being read, etc.

On the other hand, I think the price is too expensive. 0.1 BTC for a 10×10 square that nobody can see? And I bet it's worse in those Retina displays.

I don't think that option is available in Multibit. I've never seen it.