Lahat ba ng Bitcoin Private keys ay kelangan nag-uumpisa sa K or 5?

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Not quite, mate. Private keys in Bitcoin can start with a "5" if they're in Wallet Import Format (WIF). But they don't always have to.

Private keys can also be represented in other formats like hexadecimal which is just a long string of numbers and letters from A-F.

Remember though, keep your private keys safe! They're the only way to access and control your Bitcoin.

Pwedi rin bang base-64 ang isang private key?

Can bitcoin private keys also be represented in sha256 format?