A whale suffered a significant loss of 1,155 BTC (approximately $71 million) due to a critical copy-paste error. Here's how it happened:

1. A hacker meticulously observed the whale's blockchain activity and identified an address similar to the one generated by the whale.

2. The hacker executed a maneuver by transferring 0 ETH to the whale's wallet address, effectively creating a transaction history that included the phishing address.

3. Upon reviewing the transaction history, the whale encountered an address resembling their intended target, with identical numbers before and after. Unfortunately, the whale inadvertently copied and pasted the phishing address, leading to the irreversible loss of their cryptocurrency.