Patent ID: 11868509
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 5:
6. A method for detecting tampering of a digital content, wherein the method comprises:
receiving, at a computing device, a portion of the digital content and metadata for the portion of the digital content, wherein the metadata indicates that the portion of the digital content was selected for proof-of-verification, the metadata for the portion of the digital content includes a parameter identifying a technique that was used to select the portion of the digital content for proof-of-verification, and the metadata comprises hash identification data for use in retrieving from a block chain database a first hash value associated with a first encrypted version of the portion of the digital content, wherein the hash identification data comprises a block chain identifier identifying the block chain database and a network address of a node hosting the block chain database;
encrypting the portion of the digital content by the computing device, thereby creating a second encrypted version of the portion of the digital content;
computing a second hash value for the second encrypted version of the portion of the digital content;
using the hash identification data included in the metadata for the portion of the digital content to obtain from the block chain database the first hash value associated with the first encrypted version of the portion of the digital content;
comparing the first hash value with the second hash value; and
identifying the evidence of tampering of the digital content when the first hash value is not equal to the second hash value, wherein
the computing device is separate from the distributed ledger system.