Multi-chain evidence obtaining method of alliance chain based on threshold signature decision system

The invention discloses a multi-chain evidence obtaining method of an alliance chain based on a threshold signature decision system. The method comprises the following steps: 1) a supervision node in an alliance network sends an evidence obtaining demand to each service node in the alliance chain; 2) enabling a service node on the alliance chain to query related evidence information from the alliance chain and feed back the related evidence information; 3) collecting evidence information in the supervision node alliance chain; 4) enabling the supervision node in the alliance network and each alliance chain to form a threshold decision group Y; 5) enabling the supervision node in the alliance network to take the collected evidence as information m to be signed and sharing the information m to a threshold decision group for threshold signature. According to the method, a distributed threshold signature technology is adopted, chain information supervision authority is dispersed to multiple supervision mechanisms