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I was wondering that a block (Here's a Block #506398)

It's nonce is 1,229,291,212 (A little over a billion), Then why does it take so long to mine a block because my system alone can do about 500 GH/s (500,000,000,000 Hashs per second), Which is very little in comparison to what an ASICs can do.

Then why does it take so long to mine a Block??

Thanks for your help!!

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2 Answers 2

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The Nonce value does not itself indicate all tries. The resolution of Nonce is only 4 bytes. Every time Nonce gets up to 4,294,967,295(10) it resets and starts again from zero, updating the extraNonce and continuing.

http://en.bitcoin.it/wiki/Block_hashing_algorithm
'Whenever Nonce overflows (which it does frequently), the extraNonce portion of the generation transaction is incremented, which changes the Merkle root.'

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The entire purpose of proof-of-work mining is to force participants to spin their wheels doing busywork. It takes about 10 minutes to mine a block because the difficulty automatically changes so that it always takes about 10 minutes to mine a block. When more hashing power is added to the network, the difficulty increases to accommodate. The time it takes to mine a block is intentionally set to 10 minutes.

You should read What exactly is Mining? for clarification.

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  • I Understand what mining is, however what I don't Understand is 1 Billion Nonce should take 1/5 th of a second for an average computer to mine, then why 10 minutes Commented Jan 27, 2018 at 19:53
  • Because that nonce probably only worked after rearranging the transactions several times.
    – Jestin
    Commented Jan 27, 2018 at 20:37
  • There's two nonces, the OP is only looking at the first.
    – Claris
    Commented Jan 27, 2018 at 21:18

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