Genesis block hash

Uncle blocks (or Ommer) are created when two or more miners create blocks at nearly the same time . Only one block can be mined and accepted as canonical on the blockchain. The others are uncle blocks, which are not included but still provide a reward to their miners for the work done.

What are stale blocks? Stale blocks are valid blocks that are nearly become part of the blockchain—but narrowly lose out . The Bitcoin blockchain operates on an underlying rule that the longest chain wins.

Orphan blocks are extra blocks made to test block patterns or blocks that were made for quilts or projects that never got used .

Intermediate. In a few words, a candidate block is a block that a mining node (miner) is trying to mine in order to receive the block reward . So a candidate block may be described as a temporary block that will be either validated or discarded by the network.

A block reward refers to the number of bitcoins you get if you successfully mine a block of the currency . The amount of the reward halves after the creation of every 210,000 blocks, or roughly every four years.

An orphan block is created when two miners find a valid block (block A and block B) at around the same time and broadcast them both to the network .