I heard Stellar is a Ripple fork, is that right? Since Ripple does not uses a blockchain, does Stellar use a blockchain?
From my recent blog post:
Everybody knows that Stellar Network is a blockchain-powered platform, right? However, it's architecture is completely distinctive from, let's say, Bitcoin or Ethereum. There is no mining, no PoW or PoS algorithms, it resembles rather a database with a simplified API than Bitcoin sequence of blocks. So why is it listed on the CoinMarketCap with other "classic" blockchains? Because Stellar is an immutable distributed ledger.
Immutability is one of the key blockchain concepts. All blocks in the ledger are sequential, and each new block is bound to its predecessor. Nobody can modify a block somewhere in the middle of the chain and enjoy one more million on the account balance because the whole chain becomes invalid. So we can safely assume that data on the blockchain is legitimate, having been verified by multiple network validators.
P.S. Stellar is not just a fork of Ripple (like LTC<>BTC). It shares with Ripple some ideological concepts, however Stellar has its own way, and the codebase is written from the scratch.