Abstract: Various systems and methods for securely sharing private information are described herein. A method of using disambiguation data to confirm the association with an online web service prior to engaging in a transaction, includes receiving, at an unresolved credential application executing on a mobile device, a disambiguation payload, wherein the disambiguation payload is purportedly associated with a web service, and wherein at least a portion of the disambiguation payload is signed with a cryptographic key associated with the web service; extracting a network location from the disambiguation payload; obtaining verification data from a resource at the network location to verify the web service; and validating the disambiguation payload using the verification data.