【本文目标】 通过本文学习,可以实现区块链私募,基金会员工期权(代币)激励时锁仓一定时间,逐步释放的方法。
【前置条件】 1)已经完成了一个ERC20的代币,本文以作者接触的CLB为样例。 2) 懂得在REMIX调试SOLIDITY语言,不熟悉的参考文章《第十课 Solidity语言编辑器REMIX指导大全》。
一般区块链项目在私募或者员工沟通时,都会明确代币发放的政策,一般来说都会要求项目上线后锁仓多久,分几年释放。如果通过合同的方式来人工操作,一个是实现比较麻烦或者存在不可控性,另一方面也存在无法取信私募机构或者员工的情况。 那么专业的团队会选择通过智能合约来实现,这是更可信、公开、且不可串改的最佳方式。 这个实现概括讲包括3步: 1)发布ERC20代币智能合约 2)配置锁仓合约参数, 发布锁仓的智能合约 3)把要锁仓的ERC20代币转入锁仓智能合约 其中锁仓智能合约的文章极少,很多人不知怎么实现,辉哥来做个分享。
锁仓智能合约核心代码:
/**
* @title TokenVesting
* @dev A token holder contract that can release its token balance gradually like a
* typical vesting scheme, with a cliff and vesting period. Optionally revocable by the
* owner.
*/
contract TokenVesting is Ownable {
using SafeMath for uint256;
using SafeERC20 for Colorbay;
event Released(uint256 amount);
event Revoked();
// beneficiary of tokens after they are released
address public beneficiary;
uint256 public cliff;
uint256 public start;
uint256 public duration;
bool public revocable;
mapping (address => uint256) public released;
mapping (address => bool) public revoked;
/**
* @dev Creates a vesting contract that vests its balance of any ERC20 token to the
* _beneficiary, gradually in a linear fashion until _start + _duration. By then all
* of the balance will have vested.
* @param _beneficiary address of the beneficiary to whom vested tokens are transferred
* @param _cliff duration in seconds of the cliff in which tokens will begin to vest
* @param _start the time (as Unix time) at which point vesting starts
* @param _duration duration in seconds of the period in which the tokens will vest
* @param _revocable whether the vesting is revocable or not
*/
constructor(
address _beneficiary,
uint256 _start,
uint256 _cliff,
uint256 _duration,
bool _revocable
)
public
{
require(_beneficiary != address(0));
require(_cliff <= _duration);
beneficiary = _beneficiary;
revocable = _revocable;
duration = _duration;
cliff = _start.add(_cliff);
start = _start;
}
/**
* @notice Transfers vested tokens to beneficiary.
* @param _token Colorbay token which is being vested
*/
function release(Colorbay _token) public {
uint256 unreleased = releasableAmount(_token);
require(unreleased > 0);
released[_token] = released[_token].add(unreleased);
_token.safeTransfer(beneficiary, unreleased);
emit Released(unreleased);
}
/**
* @notice Allows the owner to revoke the vesting. Tokens already vested
* remain in the contract, the rest are returned to the owner.
* @param _token ERC20 token which is being vested
*/
function revoke(Colorbay _token) public onlyOwner {
require(revocable);
require(!revoked[_token]);
uint256 balance = _token.balanceOf(address(this));
uint256 unreleased = releasableAmount(_token);
uint256 refund = balance.sub(unreleased);
revoked[_token] = true;
_token.safeTransfer(owner, refund);
emit Revoked();
}
/**
* @dev Calculates the amount that has already vested but hasn't been released yet.
* @param _token Colorbay token which is being vested
*/
function releasableAmount(Colorbay _token) public view returns (uint256) {
return vestedAmount(_token).sub(released[_token]);
}
/**
* @dev Calculates the amount that has already vested.
* @param _token ERC20 token which is being vested
*/
function vestedAmount(Colorbay _token) public view returns (uint256) {
uint256 currentBalance = _token.balanceOf(this);
uint256 totalBalance = currentBalance.add(released[_token]);
if (block.timestamp < cliff) {
return 0;
} else if (block.timestamp >= start.add(duration) || revoked[_token]) {
return totalBalance;
} else {
return totalBalance.mul(block.timestamp.sub(start)).div(duration);
}
}
}
函数说明: 1,锁仓合约初始化函数constructor(...),包含5个参数:
2,期权代币释放函数release(...),包含1个参数:
3,期权代币回收函数revoke(...),包含1个参数:
完整的代码和CLB通证的调用函数,辉哥存放到知识星球,欢迎加入下载。
1] 管理员账号发布一个ERC20的ColorBay代币合约
CLB相关信息
2] 管理员账号转发500万给员工激励专用账号用于期权激励专用
3] 当前账号切换到员工激励专用账号下创建期权激励计划
4] 在CLB合约下,把CLB通证打给期权激励智能合约地址
5] [2018.08.06 17:31] 5分钟(300s)后测试分配期权
查询结果
6] 离职员工激励计划实施
7] 在CLB合约下,通证打给期权激励智能合约地址
8] [2018.08.06 21:03] 3分钟(180s)后测试分配期权
9] [2018.08.06 21:05] 4分钟(240s)后,李四离职,收回分配期权 revoke("0x692a70d2e424a56d2c6c27aa97d1a86395877b3a")
辉哥给了一个命题需求,看看谁能把这个需求实现。除了功能,要提供网页查询页面,用户输入以太坊地址,可以查到对应账户的期权代币总额,已释放额度,未释放额度。
某项目方发布10亿的代币总额,其中: 1] 机构方私募为 1.5 亿枚, 上交易所后私募锁仓三个月,之后逐月释放 20%; 2] 基金会核心运作团队持有 2 亿枚, 锁定一年, 两年内逐步释放; 3] 社区建设 1 亿枚, 海外社区核心团队, 锁定一年,两年内逐步释放;
转化为具体的时间点动作为: 1] 私募总额1.5亿枚,2018.09.01上交易所,私募锁仓三个月到2018.12.01到期,之后逐月释放情况 [2019.01.01 - 20%, 3000万枚; 2019.02.01 - 20%, 3000万枚; 2019.03.01 - 20%, 3000万枚; 2019.04.01 20%, 3000万枚; 2019.05.01 20%, 3000万枚; ] 2] 基金会核心运作团队 2亿枚,2018.09.01上交易所,锁定一年到2019.09.01, 两年内按月逐步释放; [2019.10.01 - 2亿1/24, 约833万枚; ...; 2020.10.01 - 2亿1/24, 约833万枚;] 3] 海外社区核心团队 1 亿枚,2018.09.01上交易所,锁定一年到2019.09.01,两年内逐步释放; [2019.10.01 - 1亿1/24, 约416万枚; ...; 2020.10.01 - 1亿1/24, 约416万枚;]
1)关于ERC20代币的锁仓 2) 授权和释放合约 3) 定时释放合约
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