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In the user interface of my DApp, how can I detect that a blockchain reorganization happened and what should I do to update the UI state once the fork is resolved?

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There are a few modules around that let you keep track of the "state" of a transaction (unconfirmed, X confirmations, conflicting transaction exists and is being confirmed, fully confirmed, definitely failed) and represent this info in the UI with color-coding. You should then probably only make "irreversible" changes to the data that's represented in the UI after a transaction gets to 12 confirmations.

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  • One of said modules is reflux-tx
    – caktux
    Commented Jan 21, 2016 at 12:55
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    would like to see a nodejs module. I'm considering adding the equivalent of reflux-tx to ether-pudding if not, so I can transition application state based on promises.
    – Paul S
    Commented Apr 8, 2016 at 19:03

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