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nadams 2017-05-18 08:45:55 -07:00
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@ -784,6 +784,11 @@ Let's assume, for example, that a miner Node A finds a Proof-of-Work solution fo
As the two blocks propagate, some nodes receive block "triangle" first and some receive block "upside-down triangle" first. As shown in <<fork3>>, the network splits into two different perspectives of the blockchain; one side topped with a triangle block, the other with the upside-down-triangle block.
[[fork3]]
[role="smallersixty"]
.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"]
In the diagram, a randomly chosen "Node X" received the triangle block first and extended the star chain with it. Node X selected the chain with "triangle" block as the main chain. Later, Node X also received the "upside-down triangle" block. Since it was received second, it is assumed to have "lost" the race. Yet, the "upside-down triangle" block is not discarded. It is linked to the "star" block parent and forms a secondary chain. While Node X assumes it has correctly selected the winning chain, it keeps the "losing" chain so that it has the information needed to reconverge if the "losing" chain ends up "winning."
On the other side of the network, Node Y constructs a blockchain based on its own perspective of the sequence of events. It received "upside-down triangle" first and elected that chain as the "winner." When it later received "triangle" block, it connected it to the "star" block parent as a secondary chain.
@ -794,11 +799,6 @@ Mining nodes whose perspective resembles Node X will immediately begin mining a
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]]
[role="smallerseventy"]
.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>>.