Blacklist Transfer Manager (BTM)

Introduced in

3.0.0

Contract name

BlacklistTransferManager

Type

Transfer Manager Module

Compatible Protocol Version

^3.0.0

How it works

This module allows approved employees/issuers to create and establish an automated blacklist to prevent insider investors from selling thus de-risking price swings during time-sensitive cases like earning calls. The blacklists can automatically become active/inactive at set recurring intervals.

Key functionalities (as defined in the Smart Contract)

Initialization

This module does not require any initialization.

Execute Transfer

Summary:

If the module is paused or no blacklist is imposed on the sender, the transfer restrictions are skipped for that specific transfer.
The module works by parsing through all the blacklists applied to the sender and returns the invalid transfer if any of the blacklists is currently active.
Transfers are allowed to go through if none of the blacklists applied on the sender are active at that current moment.

    /** 
     * @param _from Address of the sender
     * @dev Restrict the blacklisted address to transfer tokens 
     * if the current time is between the timeframe define for the 
     * blacklist type associated with the _from address
     */
        function executeTransfer(address _from, address /* _to */, uint256 /* _amount */, bytes calldata /* _data */)

Managing blacklist types

Admins can add a new blacklist, modify an existing blacklist or delete a blacklist at any time using the below functions

Note:

_startTime is the timestamp of the beginning of the first instance of the blacklist.
_endTime is the timestamp of the end of the first instance of the blacklist.
_repeatPeriodTime is a number of cooldown days after which the blacklist should be reactivated. If the
_repeatPeriodTime == 0 makes the period non-repeating.
_name is the name of the blacklist type.

Add Blacklist Type

Summary: This function is used to add the specified blacklist type.

   /**
    * @notice Used to add the blacklist type
    * @param _startTime Start date of the blacklist type
    * @param _endTime End date of the blacklist type
    * @param _blacklistName Name of the blacklist type
    * @param _repeatPeriodTime Repeat period of the blacklist type in days
    */
    function addBlacklistType(uint256 _startTime, uint256 _endTime, bytes32 _blacklistName, uint256 _repeatPeriodTime) public withPerm(ADMIN)

Add Blacklist Type Multi

Summary: This function is used to add multiple blacklist types in one transaction while having the same permission as addBlackListType().

Requirements:

_startTimes.length == _endTimes.length
_endTimes.length == _blacklistNames.length
_blacklistNames.length == _repeatPeriodTimes.length, "Input array's length mismatch"

    /**
     * @notice Used to add the multiple blacklist type
     * @param _startTimes Start date of the blacklist type
     * @param _endTimes End date of the blacklist type
     * @param _blacklistNames Name of the blacklist type
     * @param _repeatPeriodTimes Repeat period of the blacklist type
     */
    function addBlacklistTypeMulti(
        uint256[] memory _startTimes,
        uint256[] memory _endTimes,
        bytes32[] memory _blacklistNames,
        uint256[] memory _repeatPeriodTimes
    )
        public
        withPerm(ADMIN)

Modify Blacklist Type

Summary: This function is used to modify the details of a given blacklist type.

Requirements:

blacklists[_blacklistName].endTime != 0, "Blacklist type doesn't exist"

    /**
     * @notice Used to modify the details of a given blacklist type
     * @param _startTime Start date of the blacklist type
     * @param _endTime End date of the blacklist type
     * @param _blacklistName Name of the blacklist type
     * @param _repeatPeriodTime Repeat period of the blacklist type
     */
    function modifyBlacklistType(uint256 _startTime, uint256 _endTime, bytes32 _blacklistName, uint256 _repeatPeriodTime) public withPerm(ADMIN)

Modify Blacklist Type Multi

Summary: This function is used to modify multiple existing blacklist types as well as allow it to have the same access permission as modifyBlacklistType().

Requirements:

_startTimes.length == _endTimes.length
_endTimes.length == _blacklistNames.length
_blacklistNames.length == _repeatPeriodTimes.length, "Input array's length mismatch"

    /**
     * @notice Used to modify the details of a given multiple blacklist types
     * @param _startTimes Start date of the blacklist type
     * @param _endTimes End date of the blacklist type
     * @param _blacklistNames Name of the blacklist type
     * @param _repeatPeriodTimes Repeat period of the blacklist type
     */
     function modifyBlacklistTypeMulti(
         uint256[] memory _startTimes,
         uint256[] memory _endTimes,
         bytes32[] memory _blacklistNames,
         uint256[] memory _repeatPeriodTimes
     )
         public
         withPerm(ADMIN)

Delete Blacklist Type

Summary: This function allows the issuer to delete the existing blacklist type.

Requirements:

blacklists[_blacklistName].endTime != 0, "Blacklist type doesn’t exist"
blacklistToInvestor[_blacklistName].length == 0, "Investors are associated with the blacklist"

    /**
     * @notice Used to delete the blacklist type
     * @param _blacklistName Name of the blacklist type
     */
     function deleteBlacklistType(bytes32 _blacklistName) public withPerm(ADMIN)

Delete Blacklist Type Multi

Summary: This function is used to delete the multiple blacklist types in a single transaction.

    /**
     * @notice Used to delete the multiple blacklist type
     * @param _blacklistNames Name of the blacklist type
     */
     function deleteBlacklistTypeMulti(bytes32[] memory _blacklistNames) public withPerm(ADMIN)

Applying blacklist to investors

Allows admins to add or remove users from blacklists at any time using listed functions below:

Note:

_investor is the Ethereum address of the investor.
_blacklistName is the name of the blacklist.

Add Investor to Blacklist

Summary: This function is used to assign a specific blacklist type to an investor. The _blacklistName should be pre-existing in the contract storage, otherwise, the transaction will fail.

Requirements:

blacklists[_blacklistName].endTime != 0, "Blacklist type doesn't exist"
investor != address(0), "Invalid investor address"
investorToIndex[_investor][_blacklistName] == 0, "Blacklist already added to investor”

    /**
     * @notice Used to assign the blacklist type to the investor
     * @param _investor Address of the investor
     * @param _blacklistName Name of the blacklist
     */
     function addInvestorToBlacklist(address _investor, bytes32 _blacklistName) public withPerm(ADMIN)

Add Investor to Blacklist Multi

Summary: This function is used to assign the blacklist type to multiple investors.

    /**
     * @notice Used to assign the blacklist type to the multiple investor
     * @param _investors Address of the investor
     * @param _blacklistName Name of the blacklist
     */
    function addInvestorToBlacklistMulti(address[] memory _investors, bytes32 _blacklistName) public withPerm(ADMIN)

Add Multi Investor to Blacklist Multi

Summary: This function is used to assign the multiple blacklist type to multiple investors.

Requirements:

_investors.length == _blacklistNames.length, "Input array's length mismatch"

    /**
     * @notice Used to assign the multiple blacklist type to the multiple investor
     * @param _investors Address of the investor
     * @param _blacklistNames Name of the blacklist
     */
    function addMultiInvestorToBlacklistMulti(address[] memory _investors, bytes32[] memory _blacklistNames) public withPerm(ADMIN)

Add Investor To New Blacklist

Summary: This function is used to assign the new blacklist type to an investor. It works by creating a new blacklistType and assign it to the investor.

    /**
     * @notice Used to assign the new blacklist type to the investor
     * @param _startTime Start date of the blacklist type
     * @param _endTime End date of the blacklist type
     * @param _blacklistName Name of the blacklist type
     * @param _repeatPeriodTime Repeat period of the blacklist type
     * @param _investor Address of the investor
     */
    function addInvestorToNewBlacklist(
        uint256 _startTime,
        uint256 _endTime,
        bytes32 _blacklistName,
        uint256 _repeatPeriodTime,
        address _investor
    ) public withPerm(ADMIN)

Delete Investor From All Blacklist(s)

Summary: This function is used to delete the investor from all of the associated blacklist types.

Requirements:

investor != address(0), "Invalid investor address"

    /**
     * @notice Used to delete the investor from all the associated blacklist types
     * @param _investor Address of the investor
     */
    function deleteInvestorFromAllBlacklist(address _investor) public withPerm(ADMIN)

Delete Investor From All Blacklist(s) Multi

Summary: This function is used to delete multiple investors from all the associated blacklist types.

    /**
     * @notice Used to delete the multiple investors from all the associated blacklist types
     * @param _investor Address of the investor
     */
     function deleteInvestorFromAllBlacklistMulti(address[] memory _investor) public withPerm(ADMIN)

Delete Investor From Blacklist

Summary: This function is used to delete the investor from the blacklist

Requirement:

_investor != address(0), "Invalid investor address"
_blacklistName != bytes32(0),"Invalid blacklist name”
investorToBlacklist = blacklistName, "Investor not associated to the blacklist"

    /**
     * @notice Used to delete the investor from the blacklist
     * @param _investor Address of the investor
     * @param _blacklistName Name of the blacklist
     */
     function deleteInvestorFromBlacklist(address _investor, bytes32 _blacklistName) public withPerm(ADMIN)

Delete Multi Investors From Blacklist Multi

Summary: This function is used to delete multiple investors from a blacklist.

Requirements:

_investors.length == _blacklistNames.length, "Input array's length mismatch"

   /**
    * @notice Used to delete the multiple investor from the blacklist
    * @param _investors address of the investor
    * @param _blacklistNames name of the blacklist
    */
    function deleteMultiInvestorsFromBlacklistMulti(address[] memory _investors, bytes32[] memory _blacklistNames) public withPerm(ADMIN)

Get List Of Addresses

Summary: This function allows the issuer to get the list of the investors of a blacklist type.

Requirement:

blacklists[_blacklistName].endTime != 0, "Blacklist type doesn't exist"

   /**
    * @notice get the list of the investors of a blacklist type
    * @param _blacklistName Name of the blacklist type
    * @return address List of investors associated with the blacklist
    */
    function getListOfAddresses(bytes32 _blacklistName) external view returns(address[] memory)

Get Blacklist Names To User

Summary: This function allows the issuer/employee to get the list of the investors of a blacklist type.

   /**
    * @notice get the list of the investors of a blacklist type
    * @param _user Address of the user
    * @return bytes32 List of blacklist names associated with the given address
    */
    function getBlacklistNamesToUser(address _user) external view returns(bytes32[] memory)

Get All Blacklists

Summary: This function allows the issuer to get a list of all the blacklist names.

    /**
     * @notice get the list of blacklist names
     * @return bytes32 Array of blacklist names
     */
    function getAllBlacklists() external view returns(bytes32[] memory)

Summary: Use to get the balance of token holder for a given partition

    /**
     * @notice return the amount of tokens for a given user as per the partition
     * @param _partition Identifier
     * @param _tokenHolder Whom token amount need to query
     * @param _additionalBalance It is the `_value` that transfer during transfer/transferFrom function call
     */
    function getTokensByPartition(bytes32 _partition, address _tokenHolder, uint256 _additionalBalance) external view returns(uint256)

Special considerations / notes

function addInvestorToBlacklistMulti is limited by GAS limit and can only process the maximum number of address at a time.
To set a non-recurring blacklist, _repeatPeriodTime can be set to a zero.
All investors must be removed from a blacklist before that blacklist can be deleted using deleteBlacklistType function.

PreviousThe-STO-Manager Nextmisc

Last updated 5 years ago

Was this helpful?