I'm a senior, and just discovered 2 separate slips of what looks like a cash register receipt . They have the long string of digits on them, and a warning not to show them to anyone . I don't have any account anywhere ,just these slips of paper that I got out of a bitcoin machine . I remember holding one up to my phone to pay for services ,but that was several years ago. Is there an easy way to see if I still have bitcoin remaining ?
bitcoin ATMs supply you with a paper wallet, which should have a private key (
this is what you should never show anyone!) and a public address, which is where your coins are held on the blockchain. the better ones supply QR codes for each one, for better functionality. an example:
see that "1L.....Hn4" alpha-numeric string? that's the bitcoin address. if you plug that into a block explorer like
https://blockstream.info/ it will display the balance. if you have a QR code, you can scan it here:
https://blockstream.info/scan-qrhowever, i do urgently recommend that you obtain a proper bitcoin wallet, verify the download, and then sweep your private key into it. the paper wallet provided by a bitcoin ATM is generally not considered secure:
It is a general practice to sweep bitcoins from such a receipt as soon as possible and it is highly not advisable to use such receipts as a form of paper wallet storage. Bitcoin address was generated by a bitcoin ATM which you cannot control, so in case the machine was compromised – potentially there is a vector of attack to access your funds. So sweep bitcoins from receipt as soon as you get your own wallet, or you have address where to send them, e.g. to pay for something.
https://coinatmradar.com/blog/how-to-use-printed-paper-wallet-on-receipt-from-a-bitcoin-atm/a good choice is electrum. see here:
[GUIDE] How to Safely Download and Verify Electrum [Guide]