How did I end up sending funds to an unfamiliar address when I checked the first and last few characters?
Address poisoning is worth understanding.
Once an on-chain transfer is confirmed, it can't be reversed. Assets sent to a fake address are basically impossible to recover.
Before transferring, check the full address and network. Send a small test amount before transferring a larger amount.
Addresses that frequently send and receive stablecoins and $ETH are more likely to be targeted by address poisoning. Currently 2508.24.

#ETH