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News: The warning which may be displayed by Bitcoin Core about unknown versions is related to BIP91, and can be safely ignored.
 
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soggy-hamster
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June 12, 2012, 11:21:44 AM
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Pieter Wuille
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June 12, 2012, 03:58:29 PM
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Bitcoin transactions do not have a well-defined "from" address. Each transaction can have several inputs, each of which has potentially an identifiable address it was previously sent to. Those addresses may or may not be under control of the sender of the funds.

If you need to do refunds, ask people for a refund address.

If you need to identify individual payments, give a different (unique) receive address for each.

aka sipa, core dev team

Tips and donations: 1KwDYMJMS4xq3ZEWYfdBRwYG2fHwhZsipa
Stephen Gornick
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June 12, 2012, 09:46:13 PM
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Any help how I can do this, without using an external service like blockexplorer?

Lots of interest in doing this exact same thing.  There's going to be a lot of SatoshiDICE copycats, I suspect:

Related:
 - http://bitcoin.stackexchange.com/questions/3896

casascius
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June 12, 2012, 10:03:42 PM
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Bitcoin transactions do not have a well-defined "from" address. Each transaction can have several inputs, each of which has potentially an identifiable address it was previously sent to. Those addresses may or may not be under control of the sender of the funds.

If you need to do refunds, ask people for a refund address.

If you need to identify individual payments, give a different (unique) receive address for each.

If using any normal client, and the payment is not multisig and not coming from a website like MtGox, any and all of those inputs are addresses controlled by the sender.  They must be, otherwise the sender would not have been able to issue the transaction.  Can anyone provide a counter-example?

Companies claiming they got hacked and lost your coins sounds like fraud so perfect it could be called fashionable.  I never believe them.  If I ever experience the misfortune of a real intrusion, I declare I have been honest about the way I have managed the keys in Casascius Coins.  I maintain no ability to recover or reproduce the keys, not even under limitless duress or total intrusion.  Remember that trusting strangers with your coins without any recourse is, as a matter of principle, not a best practice.  Don't keep coins online. Use paper or hardware wallets instead.
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