Is a wallet simply a folder of private keys?
Is a wallet simply a folder of private keys? I try to understand how a wallet actually works. I know there are lots of resources around the internet, but I still can't find simple and concise answers for basic questions about wallets and private keys. How does a Ledger Nano S work? Is it simply a wallet? Is a wallet simply a folder/directory containing a number (1 or more) of private keys, each able to generate a public address? I imagine an entire wallet as a simple text file with a number of lines, each containing a private key (plus some functionality to see the number of coins sent to the public addresses associated with the private keys). What ensures that a private key, generated in a wallet, is compatible with, for instance, the Bitcoin blockchain? According to my understanding, a private key is simply an encrypted integer value. Shouldn't this encrypted integer value be registered in the Bitcoin blockchain, ensuring it's valid and all other wallets are a...