Here everything is just like a chain. Bitcoin is secured through a proof-of-work (PoW) consensus whereas Ethereum is secured through a proof-of-stake (PoS) consensus. The Sia network is secure just like bitcoin; it uses the PoW consensus mechanism. Each transaction is processed as a block and the blocks are verified by a group of miners in the mining pool Siacoin what is siacoin https://minery.io/blog/what-is-siacoin/ . These miners verify each block and work to protect the blockchain from attacks, instead they receive Siacoin tokens.
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