Quote from: Quantumplation on June 01, 2011, 07:39:32 AM

Quote from: PRCman on June 01, 2011, 06:42:46 AM

Quote from: Quantumplation on June 01, 2011, 06:36:54 AM

Quote from: PRCman on June 01, 2011, 04:09:46 AM

Quote from: Quantumplation on June 01, 2011, 03:50:47 AM

Quote from: PRCman on June 01, 2011, 03:38:48 AM

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32 merkle_root char[32] The reference to a Merkle tree collection which is a hash of all transactions related to this block
~~~~~~~~~~~~~~~~~~~~~~~What's this? where does it come from?
That ones a bit confusing and has to do with verifying all the transactions in the block more efficiently. google "merkle tree".

When mining, how to fill this field?

http://en.wikipedia.org/wiki/Hash_tree

Okay, how do we fill the tree leaves?

Transactions.

I don't understand the concept, we will have transactions after the block is found, right?
block is used for transactions.

What transaction do we have before the block found (while mining)?

Blocks contain transactions. The fact that a block contains them "verifies" them. A transaction is generated by someone saying "I want to send coins." Have a look at http://blockexplorer.com/, gives some pretty useful block data.

Thank you.

From following page, such as my understanding, when mining, the miner/client fills the Merkle with a algorithm result (like a several hash) of the creator's receiving address.

Is that true?

https://en.bitcoin.it/wiki/Block_hashing_algorithm