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6

Satoshi didn't remove the alert system; it still exists in the client. However, it cannot trigger RPC safe mode as it could before. There are no plans to remove all traces of it, as all it does in its current state is display a warning message.


6

As far as I know, the alert key is the only special one with a public key hardcoded in the client. Technically, the public key of the genesis block's output is also hardcoded in the client, but it grants no special privileges. The genesis block cannot even be spent.


6

As described in the Alerts article on the Bitcoin wiki: Only alerts that are signed by a specific ECDSA public key are considered valid. A copy of the private key is held by at least Satoshi, Gavin, and theymos. All alerts that have not expired are relayed but the client displays only the highest priority alert that hasn't yet expired and wasn't ...


5

Yes, according to Gavin Andresen via Reddit. Even if they didn't to do so, Bitcoin Core already has two other mechanisms which will produce automated alerts as the hard fork approaches: one which will take effect before the hard fork occurs, and one after (as per BIP-50).


5

Just got confirmation that Satoshi passed the signing key to Gavin before he retired, so at present only Gavin (and Satoshi if he ever returns) is able to send out alerts.


2

"Alert messages are signed with a private key that only I have." - Satoshi Nakamoto Such a spam would be pretty pointless. It would take only a few hours at most before the alert system was disabled.


1

I use Cryptocurrency Alerting. It has percentage price alerting, but it also has alerts for when coins get added to new exchanges, wallet transaction monitoring, and bitcoin mempool monitoring.


1

Try https://www.kryptolabs.io its for Facebook Messenger pretty neat and of course the other ones mentioned here.


1

Currently I'm using vertfolio https://vertfolio.com, it’s new but simple and easy to use, they have alerts based on the percent of the change ( daily and hourly ).


1

You can use coinzalert.com to monitor the Bitcoin and altcoin market.


1

I have never used it personally, but I have a lot of good things of the Bitcoin Paranoid app. It's supposed to alert you on price changes. Here's the bitcointalk thread: https://bitcointalk.org/index.php?topic=178391.0


1

If your device has a temp sensor it will show in the API output and in the Text User Interface that is default when running at the command line


1

Numerous has a "Bitcoin Value" number. You can enable notifications for it.


1

The Bitcoin Ticker app seems like it would fit your needs nicely.


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