I sent some amount of ETH to a wallet. I checked the wallets balance on ether chain. I entered the address in the search field and noticed both lowercase and uppercase versions of the address seemed to work.
I wanted to buy a few bucks more, but now I'm not sure if there is something wrong with the address I created. I'd be grateful for some guidance.
Ethereum wallet addresses are in hex [0-9A-F]*. While the address itself is case-insensitive (
Ais the same as
ato the network), the case sensitivity is used as a (optional) checksum. It was built as an after-thought to an addressing scheme that lacked basic checksum validation.
The checksum works like so:
So, you sha3 hash the address, and look at each Nth character of the sha result. If it's 7 or below, the Nth character in the address is lowercase. If it is 8 or above, that character is uppercase.
(Brought from an old Ethereum forum whose link is now broken.)