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Peer-to-peer proof of work mining may sometimes result in more than 1 blocks being mined in the same height, often due to broadcast delays. When this occur, the network will infer the longest resulting chain as the truth, whereby the blocks within the shorter chain will be regarded as Stale Blocks.
An exchange-traded fund (ETF) is a form of security that tracks a collection of securites such as stocks, bonds, index or cryptocurrency but tradeable like a single stock.
