TonTech take-home assignment

Hi! We glad you wan't to join TonTech!

As a part of your application process we'd like to see what you are capable of by giving you small TON-related task.

Problem description

We wan't you to develop smart-contract for TON for safe peer-to-peer purchasing.

There is three main characters:

• Seller
• Buyer
• Guarantor - (deal guarantor, usually it's the platform in which sales are made represented by server)

Suggested flow:

• Buyer deploys smart contract with desired amount of TON coins
• Guarantor checks if everything is OK (both onchain & offchain)
• If everything is OK - guarantor send's special signed message to contract & contract sends coins to seller
• If something goes wrong - guarantor send's special signed message to contract & contract returns coins to buyer

Technical requirements

• contract should be written in FunC language
• all companion code should be written in TypeScript
• contract is one time, it's deployed per sale
• contract should support royalties for Guarantor
• as an application of that contract we suggest to write small demo-app (web/tg bot/cli) that uses your contract

What do we pay attention to

• production readiness of the solution
• tests
• corner cases
• additional features/mechanics

Useful links

• Docs - https://ton.org/docs/
• TON library for JS/TS - http://github.com/tonwhales/ton/
• Tool for local debugging contracts - http://github.com/Naltox/ton-contract-executor
• Some contracts examples - http://github.com/getgems-io/nft-contracts