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Author Topic: Confirming Payment ... 1 block, 2 blocks, 6 blocks?  (Read 1489 times)
Stephen Gornick
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November 28, 2010, 03:14:14 AM
 #1

I sent a 1 BTC payment to MyBitcoin.  At about 10 minutes later I got the Payment Notification email acknowledging the transfer.  But my own client still showed unconfirmed.

When I logged into MyBitcoin ..., my Balance showed the 1.0 BTC.

Is the number of blocks needed before "confirming" a transaction something that is subjective?  I.e., why does the Bitcoin client wait until a different number .. (6 confirmations, I think ... ) to change to Confirmed, than what MyBitcoin uses?

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theymos
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November 28, 2010, 03:34:11 AM
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MyBitcoin probably considers a transaction confirmed after 1 block. The more confirmations, the more difficult it is for the sender to reverse a transaction. 6 is almost impossible (and never profitable), but 1 is still extremely difficult. Even 0 is quite difficult. The last few pages of the Bitcoin paper have probability calculations for this.

Maybe MyBitcoin requires more confirmations when you deposit larger amounts of BTC.

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Stephen Gornick
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November 29, 2010, 07:07:25 AM
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A nice thread on Confirmations from today as well:
  http://bitcointalk.org/index.php?topic=1994.0
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