This site did not show evidence of storing passwords in plaintext.
This site does allow secured connections (https)
This site did show a clear way to unsubscribe from their emails
This site does verify your email address.
Membership Emails
Below is a sample of the emails you can expect to receive when signed up to Kraken.
Please confirm your Kraken.io Account by clicking the button below:
CONFIRM MY EMAIL ADDRESS
Alternatively copy the link below and paste it in your browser: https://kraken.io/account/confirm/1b29c12d224f8c22
Once you confirm you will have full access to Kraken.io services and all future notifications will be sent to this email address.
We love helping customers get up and running with our system! Should you have any questions about Kraken.io simply reply to this email or contact us at support@kraken.io