Synchronisation across devices for a multitude of bitcoin wallet copies.

[MatthewLM]

Is this possible? To use the same wallet on multiple devices without needing to trust an online service to hold the wallet data. Can copies of the same wallet synchronise across various devices? Are there clever ways to do this, perhaps synchronising by analysing the blocks to calculate changes to the wallet that has occurred from other devices?

Simply curious because that would improve bitcoin a lot in my opinion.

[cschmitz]

try powerfolder, you can sync across devices over the lan and internet, fully encrypted, no cloud storage involved if the user choses so.
they also accept btc payment https://www.powerfolder.com/shop/?setCurrencyId=6

[MatthewLM]

Doesn't really solve the problem. What if you spend on your iphone, it runs out of battery, you turn on your PC and then the PC wallet is invalidated because it is not synchronised automatically even when the other device is off?

[error]

No, you can't do this, because each running client will begin to generate its own set of addresses which are different from the others. This is, in other words, a recipe for losing Bitcoins forever.

[grue]

try powerfolder, you can sync across devices over the lan and internet, fully encrypted, no cloud storage involved if the user choses so.
they also accept btc payment https://www.powerfolder.com/shop/?setCurrencyId=6

or use dropbox, which is free.

[TiagoTiago]

What happens if two clients try to write to the same wallet file simultaneously (or one after the other without either being closed) ?

[Stefan Thomas]

Webcoin will do this by default. If you're a techie and you're interested in the details, check our specification:

http://bitcoinjs.org/specs/wallet/1.0/draft/wallet-api.html

Aside from bug-fixing that's the last feature we need to implement before we can launch.

For more on the project http://bitcoinjs.org/