Everyone can see how much Bitcoin/Ether an address has, but only you know which address belongs to you. You can, however, share your address with others. It's useful to think of a Bitcoin address like an email address or a bank account number.
Like with any technological advancements and/or financial products, we strongly advise that you do some research before any form of adoption in order to prevent any potential losses. Please do a thorough check before you process any transaction as well.
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