What's the function of public and private key in cryptocurrency wallet?
In simple terms analogy I would say:
Public key is like your home address,
and Private Key is like the key with whom you open/unlock the door from your home.
You would not give keys of your home to strangers,
but your address is public for everyone, so that you can receive packages, letters, etc...
Main difference here is that if you lose keys from your home, you can break in and make a new key,
but you can not do same thing if you lose your crypto private key.
If you lose your private key, you lose your crypto so keep it safe and back up.
Unless of course you made a back up of your files, which if you use bitcoin core would be your wallet.dat, and if you use electrum/most other wallets, would be the twelve words you've written down.
So even if you lose your "regular" keys, you'll have a spare one.
To any newcomers reading this: Do not follow the link above. Do not download the wallet posted above. Just because it's on the App Store, doesn't make it safe. Many people have been scammed by malware wallets on both iOS and Android. As far as cryptocurrencies goes, Apple's and Google's screening process is simply insufficient. Only use wallets with a good track record.
2 reviews, no track record of the developer, no source code, no name recognition, no product site as far as i'm aware... Yep, you should definitely avoid this.
Their site:
https://www.antiersolutions.com/ doesn't even load for me.
Looks like they were yet another *design*? solution site before they did a 180 and became blockchain/bitcoin experts.
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https://web.archive.org/web/20180504135624/https://antiersolutions.com/