# 7.3 Pool with linear vesting

This smart contract implements a vesting pool for the controlled distribution of tokens among project participants using a linear vesting mechanism. Upon completion of the token sale, tokens begin to unlock according to the following conditions:

* **Linear Vesting:** 15% of the allocation becomes available for withdrawal immediately after the sale concludes. The remaining 85% are distributed evenly (daily) over a predetermined vesting period.
* **The vesting period depends on the purchase stage:**
  * For presale and early-stage investors (Weeks 1-8), the vesting period is 12 months (365 days). Daily unlock rate: 85% / 365 ≈ 0.23% per day.
  * For late-stage investors (Weeks 9-12), the vesting period is reduced to 9 months (275 days). Daily unlock rate: 85% / 275 ≈ 0.31% per day.
* **Cliff for the Team:** A separate 100-day cliff period is applied to the team's allocations, during which token withdrawal is disabled. After the cliff ends, linear unlocking according to the same scheme begins. **Note:** The initial 15% unlock **does not apply** to the team allocations; only daily linear vesting is in effect.

**The contract ensures:**

* **Immutability of Parameters:** All parameters (start date, vesting duration, allocation sizes) are fixed upon deployment and are immutable.
* **Calculation Accuracy:** The `Math.mulDiv` library is used for calculating unlocked tokens to prevent rounding errors.
* **Transparency:** Public view functions allow anyone to query the vesting status for any address (total allocation, amount of unlocked tokens, remaining balance for withdrawal, etc.).
* **Investor Protection:** The cliff and gradual unlocking mechanisms prevent the immediate dumping of large token volumes, incentivizing long-term commitment from participants.

The contract is compliant with the ERC-20 standard and can be integrated with external dApps to automate the distribution process and monitor vesting status.

**Distribution Scheme:**

* 15% — available immediately after the sale.
* Vesting: 85% — unlocked linearly, daily, over 365 or 275 days depending on the purchase stage.
* Team Cliff: 100 days of full lock, followed by daily linear vesting.

This contract serves as a standard tool for fair and transparent token distribution among all categories of project participants.

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