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myarbrough@oreilly.com 2014-11-25 12:59:25 -08:00
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@ -145,9 +145,6 @@ The bitcoin node then receives a new block from the network, which it parses as
Looking at this new block, the node finds the +previousblockhash+ field, which contains the hash of its parent block. It is a hash known to the node, that of the last block on the chain at height 277,314. Therefore, this new block is a child of the last block on the chain and extends the existing blockchain. The node adds this new block to the end of the chain, making the blockchain longer with a new height of 277,315. <<chain_of_blocks>> shows the chain of three blocks, linked by references in the +previousblockhash+ field.
[[chain_of_blocks]]
.Blocks linked in a chain, by reference to the previous block header hash
image::images/msbt_0701.png[scale="50"]
[[merkle_trees]]
=== Merkle Trees
@ -174,6 +171,10 @@ H~AB~ = SHA256(SHA256(H~A~ + H~B~))
The process continues until there is only one node at the top, the node known as the Merkle root. That 32-byte hash is stored in the block header and summarizes all the data in all four transactions.
[[chain_of_blocks]]
.Blocks linked in a chain, by reference to the previous block header hash
image::images/msbt_0701.png[scale="50"]
[[simple_merkle]]
.Calculating the nodes in a merkle tree
image::images/msbt_0702.png["merkle_tree"]