After all, ice floats – if everything melts apart from a circle of ice below the coin, then refreezes, there’d be no indication from this “trick” alone that anything had even happened.

Next, place a coin on top and return it to the freezer. If your freezer experiences a power outage, the ice will begin to melt, giving you an indication of how long the power was out and whether ...

This is an opinion editorial by Justin Ehrenhofer, the vice president of operations and multi-coin Cake Wallet, a Bitcoin privacy educator and a moderator of the r/CryptoCurrency subreddit. Coinbase ...

After all, ice floats – if everything melts apart from a circle of ice below the coin, then refreezes, there’d be no indication from this “trick” alone that anything had even happened.