Cryptoassets PDF Free Download

10/4/2021by admin
  • Basics
  • Example command-line application
  • After completing the example
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This tutorial introduces cryptoassets.core: what it does for you and how to set up a trivial Bitcoin wallet command line application on the top of it.

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Cryptoassets PDF Free Download

cryptoassets.core is a Python framework providing safe, scalable and future-proof cryptocurrency and cryptoassets accounting for your Python application. You can use it to accept cryptocurrency payments, build cryptoasset services and exchanges.

cryptoassets.core is built on the top of Python programming language, community ecosystem and best practices. Python is proven tool for building financial applications and is widely used to develop cryptoassets software and Bitcoin exchanges. cryptoassets.core is

  • Easy: Documented user-friendly APIs.
  • Extensible: Any cryptocurrency and cryptoassets support.
  • Safe: Secure and high data integrity.
  • Lock-in free: Vendor independent and platform agnostics.
  • Customizable: Override and tailor any part of the framework for your specific needs.
  • You can use cryptoassets.core framework in any Python application, including Django applications. Python 3 is required.
  • cryptoassets.core is designed to be extendable to support altcoins and different cryptoassets.
  • cryptoassets.core works with API services (block.io, blockchain.info) and daemons (bitcoind, dogecoind). The framework uses term backend to refer these. You either sign up for an account on the API service or run the daemon on your own server (*)
  • Basic SQLAlchemy knowledge is required for using the models API.
  • A separate a cryptoassets helper service process is responsible for communicating between your application and cryptoasset networks. This process runs on background on your server.
  • cryptoassets.core framework is initialized from a configuration, which can be passed in as a Python dictionary or a YAML configuration file.
  • For data integrity reasons, cryptoassets.core database connection usually differs from the default application database connection.
  • At the moment cryptoassets.core is in initial version 0.1 release. Expect the scope of the project to expand to support other cryptoassets (Counterparty, Ethereum, BitShares-X) out of the box.

Note

Please note that running bitcoind on a server requires at least 2 GB of RAM and 25 GB of disk space, so low end box hosting plans are not up for the task.

The basic programming flow with cryptoassets.core is

  • You set up cryptoassets.core.app.CryptoAssetsApp instance and configure it inside your Python code.
  • You set up a channel how cryptoassets helper service process calls backs your application. Usually this happens over HTTP web hooks.
  • You put your cryptoassets database accessing code to a separate function and decorate it with cryptoassets.core.app.CryptoAssetsApp.conflict_resolver to obtain transaction conflict aware SQLAlchemy session.
  • In your cryptoasset application logic, you obtain an instance to cryptoassets.core.models.GenericWallet subclass. Each cryptoasset has its own set of SQLAlchemy model classes. The wallet instance contains the accounting information: which assets and which transactions belong to which users. Simple applications usually require only one default wallet instance.
  • After having set up the wallet, call various wallet model API methods like cryptoassets.core.models.GenericWallet.send().
  • For receiving the payments you need to create at least one receiving address (see cryptoassets.core.models.GenericWallet.create_receiving_address()). Cryptoassets helper service triggers events which your application listens to and then performs application logic when a payment or a deposit is received.

Below is a simple Bitcoin wallet terminal application using block.io API service as the backend. It is configured to work with Bitcoin Testnet. Testnet Bitcoins are worthless, free to obtain and thus useful for application development and testing.

The example comes with pre-created account on block.io. It is recommended that you sign up for your own block.io account and API key and use them instead of ones in the example configuration.

First make sure you have created a virtualenv and installed cryptoassets.core and its dependencies.

Note

The example is tested only for UNIX systems (Linux and OSX). The authors do not have availability of Microsoft development environments to ensure Microsoft Windows compatibility.

Here is an example walkthrough how to set up a command line application.

Save this as example.py file.

Save this as example.config.yaml file.

The example application uses SQLite database as a simple self-contained test database.

Run the command to create the database tables:

This should print out:

The example application is fully functional and you can start your Bitcoin wallet business right away. Only one more thing to do...

...the communication between cryptoasset networks and your application is handled by the cryptoassets helper service background process. Thus, nothing comes in or goes out to your application if the helper service process is not running. Start the helper service:

You should see something like this:

You might get some connection refused errors, because the app is not up yet. Please ignore those now.

Now leave cryptoassets helper service running and start the example application in another terminal:

You should see something like this:

You will get some Rescanned transactions log messages on the start up if you didn’t change the default block.io credentials. These are test transactions from other example users.

Now you can send or receive Bitcoins within your application. If you don’t start the helper service the application keeps functioning, but all external cryptoasset network traffic is being buffered until the cryptoassets helper service is running again.

If you want to reset the application just delete the database file /tmp/cryptoassets.test.sqlite.

The example runs on testnet Bitcoins which are not real Bitcoins. Get some testnet coins and send them from the faucet to the receiving address provided by the application.

List of services providing faucets giving out Testnet Bitcoins.

No more than 0.01 Bitcoins are needed for playing around with the example app.

After sending the Bitcoins you should see a notification printed for an incoming transaction in ~30 seconds which is the time it takes for the Bitcoin transaction to propagate through testnet:

Explore model API documentation, configuration and what tools there are available.

You can also study Liberty Music Store open source application, built on the top of Django and Bitcoin.

If you are using Django see cryptoassets.django package.

Please see these tutorials

Free
  • SQLAlchemy ORM Examples by Xiaonuo Gantan

See the community resources how to contact the developers.

Сategory:Business, Economics Cryptography, Blockchain
Language: English

Cryptoassets Pdf Free Download Version

Format:EPUB
An introduction to cryptocurrencies and blockchain technology; a guide for practitioners and students.
Bitcoin and blockchain enable the ownership of virtual property without the need for a central authority. Additionally, Bitcoin and other cryptocurrencies make up an entirely new class of assets that have the potential for fundamental change in the current financial system. This book offers an introduction to cryptocurrencies and blockchain technology from the perspective of monetary economics.

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