stake.start 合约 概览 操作 (6) 结构体 (16) 表 (7) 应用二进制接口 结构体 (16) extended_symbol 的结构体属性 settings { "name": "extended_symbol", "base": "", "fields": [ { "name": "sym", "type": "symbol" }, { "name": "contract", "type": "name" } ] }