To whom it may concern:
I am preparing a book possibly an article dealing with cryptocurrency. 
The topics will include a brief summary and description of the cryptocurrency market place as well as a look at the art work associated with the various logos.
 
Many of the currencies do not have any notes or guidelines for use of their logos.  Hence I am contacting the currencies I am including requesting permission to use their logo images as part of the material.
Please  indicate so in a reply to this email.
Regards,
Bob Erlandson