Vesting Contract

This contract allows you to lock a certain amount of Toncoin for a specified time and gradually unlock them.

Vesting Parameters

Vesting parameters are unchanged and is set during deployment.

vesting_total_amount - in nanotons, the total amount of locked Toncoins.

vesting_start_time - unixtime, the starting point of the vesting period, until this moment the vesting_total_amount is locked, after that it starts to unlock according to other parameters.

vesting_total_duration - total vesting duration in seconds (e.g. 31104000 for one year).

unlock_period - unlock period in seconds (e.g. 2592000 for once a month).

cliff_duration - starting cliff period in seconds (e.g. 5184000 for 2 months).

vesting_sender_address - the address to which you can return the Toncoins (even if they are locked) at any time; also this address can append the whitelist.

owner_address - the one to whom the vesting was issued, from this address, he can initiate the sending of Toncoins from the vesting contract.

You can get this parameters by get_vesting_data() get-method.

The parameters must satisfy the following conditions:

vesting_total_duration > 0
vesting_total_duration <= 135 years (2^32 seconds)
unlock_period > 0
unlock_period <= vesting_total_duration
cliff_duration >= 0
cliff_duration < vesting_total_duration
vesting_total_duration mod unlock_period == 0
cliff_duration mod unlock_period == 0

Although the smart contract does not check for compliance with these conditions, after the contract is deployed and before sending Toncoins to it, the user can verify that all parameters are OK by get-method.

Lock

Before the vesting_start_time, all vesting_total_amount are locked.

Starting from vesting_start_time the amount starts to unlock proportionately.

For example if vesting_total_duration is 10 months, and unlock_period is 1 month, and vesting_total_amount is 500 TON then every month will unlock 500*(10/100)=50 TON, and in 10 months all 500 TON will be unlocked.

If there is a cliff period, nothing is unlocked during this cliff period, and after it has passed, the amount is unlocked according to the formula above.

For example if cliff_period is 3 months, and the other parameters are the same as in the previous example, then first 3 months nothing will be unlocked and on 3 months 150 TON will be unlocked at once (and then 50 TON every month).

Get-method get_locked_amount(int at_time) allows you to calculate how much will be locked at a certain point in time.

You can only send the locked Toncoins to the whitelist addresses or vesting_sender_address.

You can send the unlocked Toncoins whenever and wherever you like.

Whitelist

Whitelist is a list of addresses to which you can send Toncoins, even if coins are still locked.

Get-method get_whitelist() returns all whitelist addresses as list of (wc, hash_part) tuples.

Get-method is_whitelisted(slice address) checks to see if this address is on the whitelist.

vesting_sender_address can append new addresses to whitelist at any time by op::add_whitelist message.

Unable to remove an address from the whitelist.

Also, locked coins can always be sent to the vesting_sender_address (it doesn't need to be added to the whitelist separately).

Top-up

You can send Toncoins to vesting contract from any address.

Wallet smart contract

This contract is designed similar to the standard wallet V3 smart contract.

In his data, he keeps seqno, subwallet_id, public_key and accepts external messages of the same format.

Get-methods seqno(), get_subwallet_id() and get_public_key() are available.

Unlike a standard wallet, vesting contract allows you to send only one message at a time.

Send

The owner of the public key can initiate the sending of Toncoins from the vesting contract by an external message, just like in standard wallets.

The Toncoin sending can also be initiated by an op::send internal message sent from the owner_address.

In practice, both the public key and the owner_address are owned by the same user.

Whitelist restrictions

Messages that can be sent to the vesting_sender_address have the following restrictions:

• only send_mode == 3 allowed;

In most cases, addresses are added to the whitelist to allow the user to validate using locked coins or to stake locked coins into the pools.

To avoid theft of Toncoins, messages that can be sent to the whitelist have the following restrictions:

• only send_mode == 3 allowed;

• only bounceable messages allowed;

• no state_init attachment allowed;

If destination is system elector address:

• only op::elector_new_stake, op::elector_recover_stake, op::vote_for_complaint, op::vote_for_proposal operations allowed;

If destination is system config address:

• only op::vote_for_proposal operation allowed;

For other destinations:

• allowed empty messages and empty text messages;
• allowed text messages starts only with "d", "w", "D", "W";
• allowed op::single_nominator_pool_withdraw, op::single_nominator_pool_change_validator, op::ton_stakers_deposit, op::jetton_burn, op::ton_stakers_vote, op::vote_for_proposal, op::vote_for_complaint operations;

There are no restrictions on addresses not included in the whitelist.

No restrictions apply when sending unlocked Toncoins, even if we send to whitelist or vesting_sender_address.

Project structure

• contracts - source code of all the smart contracts of the project and their dependencies.
• wrappers - wrapper classes (implementing Contract from ton-core) for the contracts, including any [de]serialization primitives and compilation functions.
• tests - tests for the contracts.
• scripts - scripts used by the project, mainly the deployment scripts.

How to use

Build

npx blueprint build or yarn blueprint build

Test

npx blueprint test or yarn blueprint test

Deploy or run another script

npx blueprint run or yarn blueprint run

Add a new contract

npx blueprint create ContractName or yarn blueprint create ContractName

See Also

• Single Nominator
• vesting-contract