Once they have a key, they can obtain and spend cryptocurrency. Without the key, the holder can’t spend or convert their cryptocurrency — rendering their holdings worthless unless and until the key is recovered.
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As noted elsewhere by a prominent author in the area [25], there is not a widely accepted or consistent definition of the term “bubble”. The GDASF test used here assumes a bubble is any time series interval which deviates from a random walk to become explosive.
For those who invest in crypto for the long-term using a buy-and-hold strategy, swings like this are to be expected. The recent dips are nothing to be overly worried about, according to Humphrey Yang, the personal finance expert behind Humphrey Talks, who says he avoids checking his own investments during volatile market dips.