Which coins have their own blockchain network?
Could you please elaborate on which cryptocurrencies possess their very own blockchain networks? It's a fascinating aspect of the digital asset space, and I'm particularly interested in understanding which coins are independent in this regard. Are we referring to the original and most well-known blockchain-based cryptocurrency, Bitcoin, or does the list extend to other notable projects as well? Additionally, how do these standalone blockchains contribute to the overall decentralization and security of the cryptocurrency ecosystem?