The invention discloses a cross-border trade contract credible calling method based on a
relay chain, which comprises four core modules including an access
chain network layer, a universal gateway
interface layer, an identity
authentication layer and a
consensus layer, and is characterized in that
data transmission and
processing are divided into two scenes: in an access chain identity
authentication scene, an access chain acquires and transmits identity
metadata; after standardized coding of the general gateway
interface layer, the information is sent to the identity
authentication layer, and an authentication credential is generated and transmitted to the
consensus layer; in a cross-chain calling
consensus verification scene, an access chain initiates a calling request, the calling request is packaged by a universal gateway
interface layer and then sent to a consensus layer for
verification and consensus, and a consensus result is fed back to the access chain to form a
closed loop. According to the method, a unified cross-chain service calling and endorsement architecture is constructed, a chain-level identity authentication model is constructed, a PoVC consensus mechanism is put forward, cross-chain calling endorsement confirmation and evidence storage are achieved, efficient and credible cross-chain cooperation of a multi-
service system is finally achieved, the method is suitable for a cross-border contract performance scene, and the safety,
traceability and decentration degree are improved.