‌Four major Bitcoin altcoins:

1.‌LTC (Litecoin):

An early Bitcoin fork with similar technology.

Faster confirmation time, higher transaction capacity.

2.‌RVN (Ravencoin):

A cryptocurrency focused on payment solutions.

Uses a unique X11 mining algorithm.

3.‌DGB (Digital Coin):

A digital currency that emphasizes security and decentralization.

Multiple algorithm support, community-driven development.

4.‌DCR (Decred):

A mix of blockchain technology and democratic governance.

Allows coin holders to participate in the decision-making process.

These four cryptocurrencies have their own characteristics. LTC and RVN have their unique advantages in payment and trading, DGB focuses on security and decentralization, and DCR combines blockchain technology with democratic governance concepts. Each currency has its specific application scenarios and development potential.