Bitcoin Forum

Hello there.

I want to ask if we can be notified when new payment received to our cold wallet.

As I understand we will have "watch only address"

Can we get notification in email or push notification to our phone. (by using any wallet service).

Thanks.

Something like this? - http://bitnotify.com

If that service is dead, and it's quite old, I'm sure there'll be others. It's not exactly a complex thing to set up.

https://www.blockonomics.co/views/wallet-watcher.html?next=%2Fblockonomics#/  that's another.

Blockchain.info should be able to do that too but it's going to be more hassle to set up as you'll need to create a functioning wallet too.

oh wow. Thank you so much.

this is easier than I thought. what is the name of this kind of service?

when googling "cold wallet notification" the result are misleading.

Try Blockcypher explorer (but do not use it if the address receives a high volume transactions because it won't work) but it isn't compatible with SegWit addresses https://live.blockcypher.com/btc/subscribe/

edit:
@shield132
You can use IFTTT or Zapier to then receive the SMS, there are surely some applets than you can use to do it (or making your own)

If you have blockchain.info's mobile app on your smartphone, then mark adresses you want to get notifications, like you mentioned "watch only address", leave your smartphone in network/wifi and you'll receive notification. On another hand, there are some services which offers email notifications but non of them offers messages on your number.
Guide of blockchain: https://blog.blockchain.com/2016/05/31/how-to-use-watch-only-addresses/

wow, we can send fund from watch only address by scanning our private key. so having a nano ledger s is pointless now.

Au contraire.

The whole point of a Ledger is that it never exposes your private key to the internet but you can still transact with it.

The moment your private key is exposed to anything connected to the internet, which is what you'd do using it with blockchain.info, is the same moment you need to completely empty it.



Not sure. Perhaps Bitcoin transaction notifier is the term to use, or bitcoin transaction alert.

oh God. It is so complicated. I thought scanning private key wont stored the key details in their server.  :-\

but thanks anyway. Im gona try the blockcyper and the one with email and cold address

It's not a question of them storing, it's a question of anything else lurking on the machine you're using picking up what you're broadcasting. That's where the biggest risk lies.

Ahh. I see. Now I understand why its so.

Which mean, nano ledger as a machine that cant be hack. correct?

Correct. The point of it is that you can use it without exposing private keys.

If you store your Ledger seed insecurely people can steal your coins that way, but not through the machine itself.

However, it's still possilble your computer is infected and would show you a false address to send to so you always need to check the address is correct on the Nano's screen itself.

oh my God. Another parameter to check   :D

so:

1. private key - cant be expose for online transaction - so most of online wallet like blockchain.info are not safe.
2. cold wallet - if computer was hacked, hacker could sniff private key even with one time private key scan app like blockchain.info
3. ledger nano s - if computer was hacked, hacker create phishing destination address.

What are other parameter for newbie checklist?

*sorry if its out of topic.

1 - Blockchain.info - biggest problem is that your coins are only secured by a password and 2FA, usually SMS or email. A hacker can take control of your email, phone and get your password if the computer you're using it with has a virus. I would never use blockchain.info because I can never be sure my computer is 100% safe.

2 - Do you mean paper wallet? Either way, yes the moment you scan the private key with a compromised machine connected to the internet it's possible someone else can see it. I always empty paper wallets completely and I use the Mycelium cold storage spending feature on a phone to do it and have never had a problem.

And of course a paper wallet must only be made completely offline.

3 - Hardware wallet - no known possibility of a hack in normal use.

When you create the hardware wallet it asks you to write down the 24 word seed and store it. That allows you to restore the coins in another wallet and that's where the risk is. If someone else finds the seed then they can restore in another wallet.

So the seed must be kept safe and offline. Write it on pieces of paper or write it in an encrypted folder on a computer that will never be used on the internet. Also only open that folder on a computer that will never use the internet.

Yes, if the computer is hacked it's possible it would try to change the address on your Ledger app. All you need to do is double check the address you want to send it to on the Nano screen.