VERIFICATION OF UNIQUE ALIAS VALUES ACROSS NETWORK REGIONS

Techniques are disclosed relating to verifying that an alias value is unique across multiple different network regions. In various embodiments a server system located in a first network region may maintain an alias map that specifies encoded versions of alias values that are in use across multiple different network regions. For example, for a given alias value, the alias map may specify a corresponding encoded version of the alias value and an identifier for a given one of the network regions with which the given alias value is associated. In various embodiments, the server system may receive a user-provided alias value from a user during an account registration process and, using the alias map, determine whether the user-provided alias value is already in use in any of the network regions.