substrate 2期Team6学号99 -Eric:李彦龙的作业 第一课作业:存证以及长度限制 git地址: : 之后迁移到: : 存证部分,创建,撤销,转移,采用的是substrate2.0 pub fn create_claim(origin, claim: Vec) -> dispatch::DispatchResult { pub fn revoke_claim(origin, claim: Vec) -> dispatch::DispatchResult { pub fn transfer_claim(origin, claim: Vec, receiver: T::AccountId) -> dispatch::DispatchResult { 创建存证时长度限制: pub trait Trait: system::Trait