Bitstamp adheres to the UK AML regulations(
https://www.bitstamp.net/aml-policy/). It's within the scope of these regulations that certain rules exists for what can meet required standards for verification allowing Bitstamp to verify a customer's account.
To get verified we kindly as Bitstamp's customers to provide proofs of their residency which must be utility bills(bank/credit card statements, electrics bills, water bills, rent contracts/receipts, tax returns, council tax, etc..), no older than 3 months, sent to their names and addresses.
We must receive a scanned image of a paper document to meet the required standards.