Blockchain//Wallet

- Cryptocurrency wallet = key management software — doesn't "store" coins, coins live on-chain.

Cryptocurrency wallet = key management software — doesn't "store" coins, coins live on-chain.

Evolution: keystore files (per-account backup) → HD wallets (single seed backup)

Keystore era: each account had its own encrypted file — lose one file = lose that account forever.

HD wallet era: one seed phrase → all accounts — lose the device, not the keys.