In this lesson, you are going to build own spaceship to move through Ton blockchain. This is the entity that allows you to interact with other accounts (planets, asteroids, other spaceships) and send more complicated messages to the network.

This is the basic contract you will use for future lessons and, probably, for actual blockchain activity.

How to make network listen to

The network communicates through messages, bytes sequences that go from and/or to accounts.

Even if you have nothing in the TON, your voice still can be heard. There are two messages groups:

• internal - messages between existing accounts, both with sender and receiver;
• external - messages "from nowhere" or "to nowhere", without sender or receiver.

Most of the accounts accept wider functionality for internal messages meanwhile there are strict build-in limits for external messages. As you are not a blockchain entity, you may have a middleman account that will resend your external messages (thus make them internal) and add some Grams for them if needed. That is what your spaceship is about to do!

Hero's equipment

Any TON adventurer has two powerful tools that are designed to help in his journey:

• FunC is the main language for TON smart contracts, that is compiled to Fift assembler;
• Fift is the stack-based language for creating, debugging, and managing TON smart contracts.

You are going to face and learn both of them. Parts with func are marked by in workshop and with fift by on spacestation.

Pack your bag and go to the future. Remember: the sky lies open!