TON Onboarding Challenge Boilerplate

Here you can become a true TVM Developer on the most advanced asynchronous blockchain in the world, The Open Network (TON).

You can prove your talent using the most ancient and essential way in blockchains, starting from grandpa Bitcoin! As the first miners in TON, you will go through the Proof-of-Work smart contract and finally mine a secret reward for your TON wallet.

Who already completed the challenge?

NFT Collection on GetGems with True TVM Developers:

• Mainnet NFT collection
• Testnet NFT collection

Step-by-step (simple)

Video Tutorial

Text tutorial

• TON Onboarding Challenge

Mining process (deep dive)

Feel free to use a text version of tutorial to get help

This is a NFT collection that differs from standard NFT collections in the following aspects:

• normal NFT deployment is disabled and one can mint NFTs only by mining (similar to how PoW givers worked)
• extra get-method is added for mining info

In order to mine NFT you should send special internal message to collection contract with proof of work.

You can get current pow_complexity by calling special get-function to get mining status called get_mining_data

It returns a tensor with the following data:

( 
	int pow_complexity,
	int last_success,
	int seed,
	int target_delta,
	int min_cpl,
	int max_cpl
)

Note that seed is set to a random value after every successful NFT mint. pow_complexity is also a dynamic value and could be changed from time to time.

Layout of proof of work Cell:

Field	Type	Description
op	uint32	Always 0x4d696e65
expire	uint32	Unixtime of message expiration (should be some unixtime in future, but not greater than ~17 minutes in future.)
whom	std_addr	Address of the miner (NFT owner would be set to this address)
rdata1	uint256	Some random data
seed	uint128	Current seed
rdata2	uint256	Should equal to rdata1

Proof of work is considered to be valid only if:

• rdata1 equals to rdata2
• (expire - now()) < 1024
• seed is equal to current seed stored in contract
• hash of the proof of work message Cell is less than current pow_complexity (hash is compared as a big endian number)

Basically you need to find such value for rdata1 so that hash of the Cell is less than current pow_complexity

After this an internal message with found Cell should be sent to collection with ~0.05 TON in order to mint NFT.