Listed below are the verified claims for the record listed.
Smallest Rubik's Cube - Current world record
1.
The smallest working Rubik's Cube is "The One Cube" which is 5.7 mm wide. It was created using a 3D-printer by Evgeniy Grigeriev (Russia).
The miniature cube can be obtained here.
 
The Book of Alternative records - World records, record breakers and more!