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计算机文件的存在性,最早是通过比特币网络带有时间戳的交易实现的。
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:

  • 证明文件在某一时间点确实存在
  • 证明文件在某一时间点确实没有被篡改
  • 证明文件在某一时间点确实由某个人创建

实操

  1. Open a terminal shell on your computer.

  2. Clone the node template repository by running the following command:

git clone https://github.com/substrate-developer-hub/substrate-node-template
  1. Change to the root of the node template directory by running the following command:
    cd substrate-node-template
  1. Create a new branch to contain your work:
    git switch -c my-learning-branch-2024-04-05
  1. Compile the node template by running the following command:
    cargo build --release
  1. 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 --tmp

  1. polkadot.js.org/apps 查看

  2. 交易前查询状态 None

  3. 交易

  4. 提交交易

  5. 交易后查询状态

问题

  1. 编译报错后使用的命令
    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    
  1. 编译报错:error[E0220]: associated type BlockNumber not found for T

解决: 替换T::BlockNumberBlockNumberFor<T>

参考

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