{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to record logs in a blockchain without using Rust's println! macro?","a":"Using logging libraries: There are many logging  libraries in Rust, such as log4rs, log::Logger, etc. These libraries provide rich logging features such as log levels, filters, formatting, etc. By using these libraries, you can easily record logs in a blockchain project."}]}],"pr":"e2a68acaa97a603fe104c4eecfb281aca6a279332582f288e9dfe3aa4d5bb042"}