Quote from: JoelKatz on July 10, 2011, 05:06:15 PM

Quote from: bitless on July 10, 2011, 04:56:57 PM

1 What other fields can we change in the message when mining, other than the nonce?

The timestamp, the coinbase transaction, the list of transacations included in the block.

Quote

2 Where is the extraNonce located?

My recollection is that the 'extraNonce' is the coinbase. See here where its put into the input of the coinbase transaction:

pblock->vtx[0].vin[0].scriptSig = CScript() << pblock->nBits << CBigNum(nExtraNonce);
pblock->hashMerkleRoot = pblock->BuildMerkleTree();

Quote

3 Where is the time (and can we change it as we see fit while mining, or are we required to keep it in a certain range)?

The time is in the header, but it must be kept in a sensible range.

Good answers. I was just gonna say work with 6 other dwarfs and capitalize on woman work.