Siacoin is a utility token of the cloud storage platform called the Sia network. Sia is open-source and blockchain-based. The operations take place on Sia's own blockchain. The coin is used to pay for storage rent transactions. The coin is Proof-of-Work-based meaning that Siacoin can be mined. Another use for the coin is trading.
OST is currently based on cryptocurrency Ethereum protocol and serves as the currency of the OST ecosystem. The token is represented on the number of exchange platforms paired with other cryptos.
Factom is currently based on cryptocurrency DPoS protocol.
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Also you can see the latest FCT price on Cryptogeek.info. You can leave your feedback and reviews about Factom cryptocurrency here.