Programmer Group

PS: I have a list to answer, Click here to add me preface 1. As early as mid August, I received a fan who said that there was a development demand. Come to me to talk about whether it could be realized 2. It's really done, but because the money came from a little dark, they didn't take it in the end, and the other party didn't take it ...

This article is to learn the operation records in the official website CouchDB. For more details, see Official website. catalogue View index Start test network Clear network Install go dependency Deploy test network with CouchDB Install and define chain codes Interact with the network as an Org1 administrator Set environment variable ...

catalogue Create network Create network View the contents of the network-starter.sh file View Fabric nodes View docker network Install and approve smart contracts as MagnetoCorp Setting environment variables Package smart contracts into chain codes Install chain code (long time) View packageID Set packageID to an environment variable ...

brief introduction Ethereum-compatible parallel chains built with Substrate. It references frontier's code. Moonbeam is a developer-oriented block chain dedicated to providing compatibility with existing Ethernet developer tool chains and networks. It does this by providing a complete EVM implementation, a Web3-compatible API, and a bridge con ...

1 array – fixed / dynamic array 1.1 fixed byte array The fixed byte array is divided into bytes1, bytes2... bytes32 according to the occupied byte length Fixed byte array can only read data and cannot modify data Index access array[index] Fixed byte array conversion: high byte is converted to low byte, and low byte is intercepted Low ...

preface For reference projects, the following projects can be found in GitHub find cosmwasm: branch 0.13wasmd: branch v0.15.1cosmwasm-template: branch 0.13wasmvm: branch 0.13 Rust compilation Attention The win system deletes all unnecessary code for compilation, and the. cargo configuration file needs to be modified [build] rustflags = "- ...

Suppose we have a scenario where we need to save a password in the smart contract. When the user calls the contract to deposit a certain amount of ether, the contract will inform the user of the password. This scenario is very simple, but it is not easy to implement, because the code of the smart contract is transparent to everyone, so it is ea ...

preface Operating system: macbook pro (16 inch, 2019) Geth Version: 1.10.8-stable 1, Why use private chains Deploying smart contracts on the public chain of Ethereum requires Ethereum to initiate transactions. By modifying the configuration, an Ethereum private chain can be built locally, because it has nothing to do with the public chai ...

Parse the plugins element to complete the configuration of mybatis plug-in > Click to see the usage of the typeAliases element The plug-in mechanism of Mybtis is a very powerful function, which allows us to cut into the inside of Mybatis to perform some of the things we want to do during the operation of Mybatis. Page helper, a popular pagin ...

In this tutorial, we will analyze the internal running mechanism of async/.await in detail. We will use the async STD library instead of tokio, because this is the first t rust library that supports async/.await syntax. The tutorial of async/.await principle analysis is divided into two parts, which is the first part. Blockchain development tu ...