Telefónica Tech has launched a new documentation authentication service based on blockchain technology with legal support. The technology will be supported by Telefónica’s own TrustOS managed blockchain service and combines the user’s digital signature with a cryptographic hash of the content to be certified. Both of these elements are sealed onto the blockchain to establish legal provenance and integrity of the data. The company seeks to use this technology to replace inefficient systems such as paper documents, which are inherently error-prone, require multiple copies to be made and must be filed and archived and can be easily lost or damaged. Telefónica said that its legal affairs department has been using the technology internally to monitor confidential information communicated with its partners. This way, whenever there is an incident or claim related to a potential breach of confidentiality, it can be easily demonstrated using digital evidence what had been shared, when and by whom.