Abstract: Exemplary embodiments provided herein include a method for safe creation, custody, recovery and management of a digital asset, agnostic to an underlying blockchain technology, the method including establishing a virtual layer where three private keys are generated, transacting the digital asset by using two of three of the private keys and multi-party computation techniques, abstracting interactions between the three private keys from the underlying blockchain technology, having a digital asset transaction considered as a single-signature by the underlying blockchain technology, and recovering the digital asset if any of the three private keys is no longer available. Additionally, the digital asset may be a cryptocurrency, and a party may be disconnected from any network during the normal user operation phases. Furthermore, the digital asset transaction may be considered as a single-signature, as seen by the underlying blockchain technology, and is associated to a public key PK_ABC.

Abstract: Solar panel tube, comprising a first pipe (11); a second pipe (12); a first insulating material (13) surrounding said first pipe; a second insulating material (14) surrounding said second pipe; said first insulating material comprising a supporting layer treated with aerogel; said second insulating material comprising a supporting layer treated with aerogel; wherein said first and second insulating materials (13, 14) are wrapped in a nylon thread winding (20) and said first and second insulating material are further wrapped by a protective layer (15).