What's the most simply programmed cryptocurrency that is being actively traded on exchanges? [closed]

Bitcoin and ethereum has a lot of bells and whistles that make their codebases harder to understand. Is there something that is as boilerplate as this that is real i.e. a actively traded cryptocurrency? Specifically I'm looking for one that has:

• wallets and simple transactions
• a mining algorithm
• the ability to bootstrap a peer node, then connect to and search a peer network for block data to download

The following traits are not things I'm looking for:

• segwit
• lightning network
• bloom filters
• space saving features
• multisig
• fancy transactions (timelocked payments, etc)

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