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Using the daemon and not a 3rd party pinging service, what is the best way to get notified of new payments? Do we need to constantly poll the server?

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    AFAIK, there's no way in the standard client to add a callback. Seems like it would be a useful feature though.
    – Nick ODell
    Commented Feb 25, 2013 at 17:21
  • Watch only addresses. On a mobile phone wallet.
    – vi.su.
    Commented Feb 25, 2013 at 23:03

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Bitcoin New transactions can be discovered by polling using the listsinceblock API command with the Bitcoin.org client.

Beginning with v0.8.2 of the Bitcoin-Qt/bitcoind client is -walletnotify option that can run a process when a transaction that affects the wallet is seen.

The BitsOfProof supernode will offer this as well I believe.

[Update: Thanks to Pelle's answer to a related question,

You can do this using BitcoinJ by implementing the PeerEventListener interface.

The OnTransaction will be called every time a new Transaction is broadcast out and received from a Peer ]

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  • Updated to refer to how -walletnotify will help with this.
    – Stephen Gornick
    Commented May 28, 2013 at 14:31

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