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关于区块的hash计算
对区块的各个字段进行hash有格式要求吗（需要先将区块内容转换成什么格式），已经试过用gob的encoder和json的序列化，并且序列化顺序和文档中一致，都没办法过测试
关于测试用数据库的问题
我在调试以下代码(来源utxo_set.go)时
b := tx.Bucket([]byte(utxoBucket))
c := b.Cursor()
for k, v := c.First(); k != nil; k, v = c.Next() {
outs := DeserializeOutputs(v)
for _, out := range outs.Outputs {
if out.IsLockedWithKey(pubKeyHash) {
UTXOs = append(UTXOs, out)
}
}
}发现c.First()必然会返回k= nil，这使得里面的循环根本不会执行，从测试样例来看来说测试用的数据库里面是有东西的，请问一下这是什么原因
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