Probability of typing a wrong Bitcoin address
I heard someone say that Bitcoin is dangerous because you could easily make a typo when entering an address, sending money to the wrong person, and have no recourse. There are dangers associated with Bitcoin, such as losing a private key, but address typos are not a major concern. Checksums There are several kinds of Bitcoin addresses. Each is at least 20 bytes (160 bits) long, with at least 4 bytes (32 bits) of checksum. The chances of a typo resulting in a valid checksum are about 1 in 232.