Isnt that a bad idea for a phone? I mean you usually have 1, 2 or at least very few addresses on a phone in comparisson to the number you might have on a regular machine. But in order to send the change to a fresh address the phone would have to generate a new key pair and your backup would need an update. On the other hand if you allready have several private keys and addresses generated you could just add one of them as another receiving address.
Please lookup
https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki and
https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki. With just one backup, you can securely generate an unlimited number of addresses.
Breadwallet always sends change to a new address.
Yes, a HD wallet would certainly solve the problem of the backup. I actually had that in mind when I wrote this, but I couldnt come up with one. I was more thinking out loud than shouting: OMG DONT DO THAT!!111 I recently tested bither and while I like the way you can generate keys, I dont like that they restrict the possible keys for a hot wallet to 10. Sadly no breadwallet for android, but I just read greenwallet is HD as well.
Shorena said, it is bad for a phone. Phones can be attacked easier than a computer. So it is bad. That's the point here.
~~MZ~~
Please explain to me how iPhone is more easily attacked than a computer.
Be as in depth as possible in your justification.
The problem is not the phone itself but the way most users handle their phone - or at least a lot, I dont have actual numbers here, its just something I observe when people use their phones. TouchID is just a gimmick and provides next to no security [1]. Passcodes and lengthy passphrases are barely used because it takes to long to unlock the phone. 4 or 6 digit PIN can be shoulder surfed as well as these patterns people tend to use. An additional risk for the patterns is that they show on the front of the phone when used with oily skin. This however has nothing to do with the way the btc wallet handles change and should just tell you that you should not hold more bitcoin on your phone than you would in your regular wallet.
[1]
http://www.ccc.de/en/updates/2013/ccc-breaks-apple-touchid
