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After a few weeks of searching for an answer, I decided to ask here.
I want to accept a Bitcoin payment, to a specific wallet, and immediately, when the user approved the payment, to receive an indication that the payment was made.
The problem is, I don't want to wait until it is verified in a block, which takes around 10 minutes, I need the approval in seconds, not minutes.
How can I receive an indication that a Bitcoin transaction was occured to my wallet, in the last seconds?
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If using the wallet notify option in bitcoin.conf, you can get a notification any time a transaction occurs on the network that matches a bitcoin address in the wallet. To use this, of course, you'll have to keep Bitcoin-QT or bitcoind running at all times.
https://en.bitcoin.it/wiki/Running_Bitcoin
Once you have the transaction id, you'll have to look up the transaction, either at an online service like blockchain.io or use a bitcoind json-rpc command to learn more about the transaction and what action you would like to take.
1The standard Bitcoin client will show pending transactions as soon as they hit the network. There is some risk in accepting a zero confirmation transaction. If this is for a brick and mortar establishment it is not likely that a double spend attack can be performed. However online I would be more conservative. Particularly if the item being sold is not revocable such as a digital download. – Mark S. – 2014-02-01T19:05:56.320
Welcome to StackExchange, Ohad. I made slight edits to your question, please feel free to correct it, if I changed something so that it doesn't capture your intent. – Murch – 2014-02-01T20:36:33.027
Related: How do I accept bitcoin payments at a real world store?
– Murch – 2014-02-01T20:38:34.520