Here’s how to submit your code for the blockchain contest depending on the goal at hand:

1. Submit an archive containing your source code, a howto manual and a build script (if necessary) to @jobs_bot  (choose Blockchain Contest).

Or:

2. Submit a pull request with the TON VM/compiler improvement on GitHub. Describe the issue in the comment to your pull request. In addition, submit the link to the pull request and an archive as described in 1. demonstrating the new features suggested in the pull requests to @jobs_bot.  

Or:

3. Submit a pull request on GitHub. Describe the issue in the comment to the pull request. Submit the link to the pull request to @jobs_bot.