Through instructions in their source codes, cryptocurrencies automatically adjust to the amount of mining power working to create new blockchain copies — copies become more difficult to create as mining power increases and easier to create as mining power decreases.
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.

“The manual burns, alongside the company having a pretty large stake in the coins, just speaks to me of a manipulation risk,” said Jasper Lawler, head of research at London Capital Group, an online brokerage firm offering cryptocurrency derivatives. “Whenever there’s some sort of mechanism to stop selling, that’s a bit of a warning sign.”
HONG KONG/BEIJING (Reuters) -Didi Global is preparing to relaunch its ride-hailing and other apps in China by the end of the year in anticipation that Beijing's cybersecurity investigation into the company will be wrapped up by then, three people directly involved in the relaunch said. The people, who declined to be identified as the information was private, said they expected China's cyberspace regulator to finalise any penalties on the company in December. In July, the powerful Cyberspace Administration of China (CAC) ordered app stores to remove 25 mobile apps operated by Didi - just days after the ride-hailing giant listed in New York.