Site:
blockstack.org
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.
Crypto.com Chain is one of the products in Crypto.com’s lineup of solutions designed to accelerate the global adoption of cryptocurrencies as a means of increasing personal control over money, safeguarding user data and protecting users’ identities. The CRO blockchain serves primarily as a vehicle that powers the Crypto.com Pay mobile payments app.
Dogecoin (DOGE) was founded in the US in 2013 as a joke but quickly gained a large following. It became a popular cryptocurrency (DOGE) used for tipping the content creators (mainly on Reddit and Telegram). As the creators had no serious plans for their currency they didn't elaborate a roadmap and were not working on the improvement of their project too much. The founder of Dogecoin Jackson Palmer left the project in 2015.