Abstract: This invention relates generally to blockchain application implementations. It can be used for allowing regular users to obtain formal authorization for accessing files from blockchain powered file storage devices. Before a user accesses a file, a smart contract should be invoked and check if the user device possesses an authorized file access token which is non-fungible token and recorded in the blockchain network. Accordingly, this invention can turn a file abstractly into a token that can be traded or distributed on the internet. Furthermore, these files are encrypted by the access token and binding with it, unauthorized access or illegal copy is not possible. Eventually, Digital File becomes tradable and unique Digital Asset, which will result in a new era of e-commerce transactions. Virtual things Real.

Abstract: This invention relates generally to blockchain application implementations. It can be used for allowing regular users to obtain formal authorization for accessing files from blockchain powered file storage devices. Before a user accesses a file, a smart contract should be invoked and check if the user device possesses an authorized file access token which is non-fungible token and recorded in the blockchain network. Accordingly, this invention can turn a file abstractly into a token that can be traded or distributed on the internet. Furthermore, these files are encrypted by the access token and binding with it, unauthorized access or illegal copy is not possible. Eventually, Digital File becomes tradable and unique Digital Asset, which will result in a new era of e-commerce transactions. Virtual things Real.

Abstract: A socket cover includes a body and a base. The base includes a passage with a middle portion and two terminals. The width of the middle portion of the passage is smaller than the width of the two terminals of the passage. The body includes a pin, extruded in a direction parallel with an axis and pivotable about the axis relatively to the base. The pin of the body passes through and slides in the passage. When the pin is abutted against one of the terminals of the passage, the pin lodges in the terminal of the passage, so as to fix the body on the base.