And second, by solving computational math problems, bitcoin miners make the bitcoin payment network trustworthy and secure, by verifying its. How can I verify my bank account without using "SOFORT" or "btccashwiki.com"? I use the PhotoTAN procedure of the Comdirect Bank. How can I verify my bank. LocalBitcoins lets you buy Bitcoin without verifying ID, but only up to 1, euros or equivalent per year. It does not let you sell Bitcoin without.