A bedding foundation is manufactured with a cover having a welt cord extending upwardly to create a seal when a mattress is placed on the foundation. A pre-computed data protection field is stored, either as part of a returned index of a content-addressable memory or in a separate storage. An operation can trigger an event. The signed message digest represents an attestation as to the authenticity of the content from the sender. The linking-fixing unit is mounted in the base hole and can move along the axial direction of the base hole and can be engaged the base. At least one side of the strap members has loop members thereon which mate with pieces of hook-type material secured adjacent the ends of the strap members.