Bitcoin Forum

Hi all,
I've just set up an Electrum Cold Storage and it has worked well on my first transfer.  But I do have a few questions:

1. How can I create a QR code from my etherium cold storage, in order to make it easier to send funds to it?
2. Can I create a watching only wallet on the android app?
3. Is there any issue sending funds to my etherium offline wallet, without actually having access to it, or without having a PC with my watching wallet with me?
4. Can I be certain that the receiving key in my offline wallet will not change.  I notice that in my offline wallet, there is an option to view and edit a list of keys.  How can I be sure, when I'm away from my wallet, and can't double check the keys, that I can deposit into it without issues.  Or do I always need to have access to my watching wallet?

Cheers,

Just go to the "Receive" tab and it should have a QR code near your address. Or just search your address on Blockchain.info and save/print the QR code.

Yes. You can use for example, Sentinel[1] or Mycelium[2] for watch-only addresses.

No. As long as you have the private key or seed backup, you may receive as many coins as you want and only access your wallet when you want to spend it. No need to have the software opened or even installed for receiving coins.

What do you mean? Your address will always stay in your control as long as you have the private key or the seed backup (if it's a HD wallet). The wallet software is basically just a client to manage your coins in the network by using the private key associated with your address.

If you create an address, you can just receive coins forever in this address and wherever you want to spend it, just import the private key in a wallet, sign the transaction and broadcast your spendings.

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[1] https://play.google.com/store/apps/details?id=com.samourai.sentinel
[2] https://play.google.com/store/apps/details?id=com.mycelium.wallet

If you go to wallet>master public key then when you use it with a watch only wallet, you can get the addresses from that on an online wallet.
Yes, you can use your public key or specific addresses in the watching only wallet on the android app (I think it's the middle option on startup of the app).
Generally, on an online computer. You set up a watch only wallet.
You create a transaction and export it to a file.
You can then put the file on a USB stick, put it into the offline computer and import the transaction. Then clicking to "Sign" the transaction.
Then, back on the online computer, you can broadcast this transaction, reloading the signed address.
Yes, recieving addresses/public keys and private keys are all permenant and the seed will generate them for you as well.

it is best to stick with electrum for android as the watch only wallet too. specially if you are not just using the watch-only wallet for checking balance but also you want to use it to make raw unsigned transactions to sign with your cold storage.
the raw transactions that electrum builds for signing are specific to it since they have more in their scriptsig for helping the cold wallet in signing.