Topic: What a miner does? (Read 1253 times)
Miners typically do not modify the timestamp - they just use the timestamp in the block, as received by the getwork call.
What is "ModifyNonce(blockheader, nonce)"?
sticks the incremented nonce into the block header, replacing the previously tried one.
I'm a total noob at this but, if I didn't misunderstand this, the current timestamp is also took into account. Else, a given block could be unsolvable if it happens that none of the 2**32 nonces result in a hash less than the target.
Yes, there would need to be a ModifyTimestamp(blockheaders, timestamp) step, but whenever the nonce overflows, the ExtraNonce part of the generation transaction gets incremented.
What is "ModifyNonce(blockheader, nonce)"?
sticks the incremented nonce into the block header, replacing the previously tried one.
I'm a total noob at this but, if I didn't misunderstand this, the current timestamp is also took into account. Else, a given block could be unsolvable if it happens that none of the 2**32 nonces result in a hash less than the target.
What is "ModifyNonce(blockheader, nonce)"?
sticks the incremented nonce into the block header, replacing the previously tried one.
What is "ModifyNonce(blockheader, nonce)"?
loop:
var blockheader = DoGetWorkRPCCall()
var target = ExtractTarget(blockheader)
for nonce in 0..4294967295:
var attempt = ModifyNonce(blockheader, nonce)
var hash = SHA256(SHA256(attempt))
if (hash < target)
ReportSolution(attempt)
i believe should be (hash <= target)
otherwise, looks right to me.
loop:
var blockheader = DoGetWorkRPCCall()
var target = ExtractTarget(blockheader)
for nonce in 0..4294967295:
var attempt = ModifyNonce(blockheader, nonce)
var hash = SHA256(SHA256(attempt))
if (hash < target)
ReportSolution(attempt)
Just to understand the process, what a miner does? Hash the block header (https://en.bitcoin.it/wiki/Block_hashing_algorithm)? Someone has a pseudo-code for that? I have looked inside m0mchil-poclbm and jsMiner.js... It was confusing for me...
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