Contents:

* wallet
Advanced upgradable multisignature wallet along with a TON collator emulator testing suite written in FIFT, and some scripts to test the wallet using the actual TON collator.

* toolchain Some automatic builder scripts and wrappers around the funC compiler and fift, along with a tweaked zerostate generator and testgiver scripts.

* test
A small bugreport about issues with fift exception traces

And more! Each directory has a README.md, explaining in detail the structure of  smart contract, fift scripts and testing platform.
Had loads of fun with this, enjoy!

Btw feel free to use the testing suite (both native fift and wrapped bash) script to test the other submissions, it really made my life easier.

Very good and well-thought solution.
plus:
Good speed (0.055G for a transfer with n=16, k=10)
seqno is required only for new orders.
Code upgrade supported.
Great tests.
All required features are implemented.

minus:
Needed a minor bugfix (there was no replay protection in initialization).

multisig initialization message is not protected from replay (with a seqno, for example). As a result, the wallet is completely drained after initialization message.

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Sync channel:
from README: "This is an almost finished lightning payment smart contract."

The code is nice and easy to read.
But am I right that it won't work if one of the parties tries to cheat?

But it is a nice try for 24 hours, anyway.