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nadams 2017-05-18 08:41:21 -07:00
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@ -790,14 +790,14 @@ On the other side of the network, Node Y constructs a blockchain based on its ow
Neither side is "correct," or "incorrect." Both are valid perspectives of the blockchain. Only in hindsight will one prevail, based on how these two competing chains are extended by additional work.
[[fork3]]
.Visualization of a blockchain fork event: two blocks propagate, splitting the network
image::images/mbc2_1004.png["Visualization of a blockchain fork event: two blocks propagate, splitting the network"]
Mining nodes whose perspective resembles Node X will immediately begin mining a candidate block that extends the chain with "triangle" as its tip. By linking "triangle" as the parent of their candidate block, they are voting with their hashing power. Their vote supports the chain that they have elected as the main chain.
Any mining node whose perspective resembles Node Y will start building a candidate node with "upside-down triangle" as its parent, extending the chain that they believe is the main chain. And so, the race begins again.
[[fork3]]
.Visualization of a blockchain fork event: two blocks propagate, splitting the network
image::images/mbc2_1004.png["Visualization of a blockchain fork event: two blocks propagate, splitting the network"]
Forks are almost always resolved within one block. While part of the network's hashing power is dedicated to building on top of "triangle" as the parent, another part of the hashing power is focused on building on top of "upside-down triangle." Even if the hashing power is almost evenly split, it is likely that one set of miners will find a solution and propagate it before the other set of miners have found any solutions. Let's say, for example, that the miners building on top of "triangle" find a new block "rhombus" that extends the chain (e.g., star-triangle-rhombus). They immediately propagate this new block and the entire network sees it as a valid solution as shown in <<fork4>>.
[[fork4]]