I strongly suggest not doing this.

For example, if you scan a QR code with an external app, the private key is likely logged to the Android system log (because it is being passed into the wallet app as an intent). From there, it can be read by just about any app. Lots of apps already request the "read log" permission - if there is just one black sheep you've had Bitcoins on that key.

If you want to pass Bitcoins around, use a Bitcoin transaction.

Ah, now I understand why the dollars have "In god we trust" written on them. That's short for "Only god knows if you will get your value back"... (-:

I just pushed bitcoinj 0.10.2. Read the announcement here.

One small note: If you want to test the key restore process, just try restoring one of your backups into your existing wallet.

It should say something like "restored 0 (of x) keys", where x is the number of keys that is in your backup. Those keys were decrypted successfully, and the only reason no keys were imported is that they are already in your wallet.

I guess everyone here is wrong. 

You can send any amount with no fee, if you mine your own block.

Currently there is no proper way, except for manually checking the balance.

See issue http://code.google.com/p/bitcoinj/issues/detail?id=425.

I have no idea what you're doing. Please describe your whole setup, what you want to do, what you expect to see and what you're seeing instead.

Just one thing: Bitcoin does not really have a concept of from addresses. Some clients (including Bitcoin Wallet) try to display them for historic reasons, and they fail at it (sometimes).

The strongest one is your own. Run a bitcoind/-qt instance and point bitcoinj to it.

Fair enough. It just reminds me of the HTTP "Referer" (-:

Very cool, thanks for the statistics!

BitcoinJ is still using the old camelcase spelling.

It should work again now, since the bad exchange rate has been corrected.

If it happens again, I'll release an update. Too bad things like this always happen while sleeping...

Sorry for the inconvenience.

A little update from my side: After realizing that my previous SD card had 32 MB not 32 GB , I finally bought a new card and installed Raspbian on it. And yeah, my raspi boots.

Now I wonder how do will Trezor setup be able to put its python software on the shield, given I do not have any network on the raspi.

Anyway... slush, I just read that python-ecdsa has been released. Does that change anything regarding the installation?

I'm not sure what you mean by "does not count".

I'd expect that a standard tx from me to myself should not touch any balance - except for the fee -, be it available or estimated. Reason: We expect transactions created by ourselves will confirm shortly, because we created them ourselves (adding the correct fee etc.). We thus should be able to build transactions on top immediately without the risk of building unconfirming chains.

Up to now, when talking about this topic we always looked at spending our own change. But there is no reason this should not also work for payments to ourselves. I assume for bitcoinj it will not make any difference.

It is best described by the class CheckpointManager in bitcoinj. Have a look at the constructor for how the file format is read.

Well I wanted to try if communication is possible. For it to be usable, I guess someone should build a "mobile" version of the Trezor.

Ok so I take it the only connection I have to make is the USB port on the shield?

Can we go one step back and explain how to set up the thing? For example, my Raspberry + Trezor sandwich has 3 USB ports - which one is the correct one? Do I need an SD card to boot up? I've never used a Raspberry before.

It's using bitcoin charts, which averages all exchanges (and 24h of time) weighted by trade volume. So yes, Mt. Gox is in there to some amount.


What's that? Google does not know about it.

"Close program" is very power-userish and clearly a relict of the past. Most users just don't care what lies behind them, they just open the next program.

Heck, even the concept of programs is obsolete. The only thing that counts is tasks. That's the main theme of Android, as it was designed from version 1.0 on.

Thanks, I filed an issue. However, I think it will just redirect you back to Google Code.