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Block non-convergence soon?
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Topic: Block non-convergence soon? (Read 1429 times)
mimarob
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Block non-convergence soon?
December 26, 2010, 10:36:49 AM
#1
hello!
am I rightly informed that the nonce is only 32 bits?
Does this in turn mean that there are "only" 2^32 or about 4 billion (4E9) combinations to try for each block?
If so, then when network hashing capacity reaches 4 000 000 kHash/sec the block would be solved in one second on average?
This contradicts the onlïne hash-rate calculator, which states about 4 hours, at present difficulty.
Sorry if this has been up before, but I'm really puzzled..
davout
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1davout
Re: Block non-convergence soon?
December 26, 2010, 10:52:15 AM
#2
The nonce overflows very often, but the timestamp changes often too
, and even if it didn't the merkle root can
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mimarob
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Re: Block non-convergence soon?
December 26, 2010, 11:10:08 AM
#3
aha, so in general any given block with the nonce as the only variable is not likely to have a solution at all?
Are there some statistics on how often the non-nonce parts of the current block changes?
Mike Hearn
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Re: Block non-convergence soon?
December 26, 2010, 11:26:50 AM
#4
There is an "extraNonce" part of the block. It's where the script would be in the generation transaction, called the coinbase data. When nonce overflows extraNonce is incremented.
jgarzik
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Re: Block non-convergence soon?
December 26, 2010, 03:37:12 PM
#5
Quote from: mimarob on December 26, 2010, 11:10:08 AM
aha, so in general any given block with the nonce as the only variable is not likely to have a solution at all?
It is always possible that there is
no solution
for the entire range of nonce (0 - 0xffffffff).
However, the timestamp and extranonce are changed every few seconds, as is merkle tree root. This helps avoid a situation where we get stuck with no solutions.
Jeff Garzik, Bloq CEO, former bitcoin core dev team; opinions are my own.
Visit bloq.com / metronome.io
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