Substrate 区块链应用开发之存证模块的功能开发
Substrate 区块链应用开发之存证模块的功能开发存证是一种在线服务，可用于在某一时间点验证盘算机文件的存在性，最早是通过比特币网络带偶然间戳的交易实现的。
存证的应用场景有：
[*]数字版权
[*]司法存证
[*]供应链溯源
[*]电子发票
[*]...
存证的作用是：
[*]证实文件在某一时间点确实存在
[*]证实文件在某一时间点确实没有被篡改
[*]证实文件在某一时间点确实由某个人创建
实操
[*]Open a terminal shell on your computer.
[*]Clone the node template repository by running the following command:
git clone https://github.com/substrate-developer-hub/substrate-node-template
[*]Change to the root of the node template directory by running the following command:
cd substrate-node-template
[*]Create a new branch to contain your work:
git switch -c my-learning-branch-2024-04-05
[*]Compile the node template by running the following command:
cargo build --release
[*]In the same terminal where you compiled your node, you can now start the node in development mode by running the following command:
./target/release/node-template --dev --tmphttps://img2024.cnblogs.com/blog/2486240/202404/2486240-20240405144114493-1267667684.jpg
[*]polkadot.js.org/apps 查看
https://img2024.cnblogs.com/blog/2486240/202404/2486240-20240405144146671-2046480440.png
[*]交易前查询状态 None
https://img2024.cnblogs.com/blog/2486240/202404/2486240-20240405144203902-1453731862.png
[*]交易
https://img2024.cnblogs.com/blog/2486240/202404/2486240-20240405144220989-361777481.png
[*]提交交易
https://img2024.cnblogs.com/blog/2486240/202404/2486240-20240405144239015-1672047049.png
[*]交易后查询状态
https://img2024.cnblogs.com/blog/2486240/202404/2486240-20240405144253113-571996729.png
问题
[*]编译报错后使用的下令
cargo clean
cargo update
cargo update -p wasm-bindgen
cargo update -p librocksdb-sys
cargo update -p schnorrkel@0.11.4
cargo update -p anstream@0.6.13-Z sparse-registry
[*]编译报错：error: associated type BlockNumber not found for T
https://img2024.cnblogs.com/blog/2486240/202404/2486240-20240405144317870-468954520.png
办理： 更换T::BlockNumber为BlockNumberFor
[*]https://substrate.stackexchange.com/questions/9848/associated-type-blocknumber-not-found-for-t
参考
[*]https://docs.substrate.io/tutorials/build-a-blockchain/build-local-blockchain/
[*]https://substrate.stackexchange.com/questions/9848/associated-type-blocknumber-not-found-for-t
[*]https://polkadot.js.org/apps
更多详情
[*]https://github.com/qiaopengjun5162/substrate-pallets-poe
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