The most tragic thing I've heard in the crypto world is: Two friends jointly holding the Bitcoin account keys, one of them passed away unexpectedly, and the other couldn't access the account, watching the opportunity to get rich slip away.

There were two international students who were good friends, let's call them A and B for now. A and B were first exposed to Bitcoin while studying abroad and both recognized its commercial value. They then decided to collaborate and invest all their assets in Bitcoin. At that time, Bitcoin was just emerging, and they had at least thousands of Bitcoins in their accounts.
Because the Bitcoin was purchased with the joint funds of A and B, it is placed in a shared account. Both parties originally intended to wait for the future appreciation of Bitcoin. In order to prevent either party from succumbing to temptation and selling the Bitcoin without the other's knowledge, the account key is split into two parts. A and B each hold half of the key information, and only through their cooperation can the Bitcoin account be accessed.
Later, A and B returned to their home country for development. The intersection of their lives became less and less, but they still maintained a close friendship. Seeing Bitcoin continue to appreciate, the Bitcoin in their joint account has also been kept without being sold, thinking that the future appreciation potential will certainly be greater and greater.
Until the unexpected happened, A was killed in a car accident while traveling, without time to explain the aftermath. B, though saddened by the death of a good friend, was also concerned about the whereabouts of the other half of the Bitcoin account key. However, A's family had no idea about this, and even after going through A's belongings, they found no trace of the other half of the key. The most significant feature of a Bitcoin account is security. B alone cannot open the account, and the joint account with A has become a dormant account following A's death.
In recent years, the price of Bitcoin has been soaring, almost rising to the sky. B can only watch helplessly as the price of Bitcoin skyrockets, unable to access the joint account they once shared to sell their own portion of Bitcoin for cash. B has developed severe depression in a state of frustration, anxiety, and unwillingness, and has to rely on medication and psychological treatment to face this painful reality. In fact, it's not difficult to understand. Another person might also be unable to come to terms with it, perhaps even worse than B. This is the most tragic story I've heard about the crypto world.