What is the main difference between a Physical bitcoin and Paper wallet ?
And which one is more secure ? And why ?
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A physical bitcoin is simply a metal or plastic coin-shaped object, usually with a private key embedded aside. It is functionally identical to a paper wallet.
Both are only as secure as their storage medium, and passphrase, if one was set during creation.
A paper wallet is more secure than a physical coin with addresses, as the former you can make yourself, on your own machine, while with a physical bitcoin you never know under what conditions it was manufactured and who could have copied the keys.