http://walletdvl5avrmoxk2fwsf5b76zkmbkoo3r6kqeesq5hsgnq7xhbciad.onion/bitcoin-address-format
A Bitcoin address , or simply address , is an identifier of 27-34 alphanumeric characters, beginning with the number 1, 3 or bc1, that represents a possible destination for a bitcoin payment. Addresses can be generated at no cost by any user of Bitcoin.