> For the complete documentation index, see [llms.txt](https://doc.cryptostone.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.cryptostone.org/protocol-architecture/36_lock_up_depreciation_and_return_structure.md).

# 36 Lock-up and Return Structure

When a user chooses a lock-up period and deposits STONX into a mining pool, a portion of STONX is burned as depreciation at the time of unstaking after the lock-up expires, and the remaining STONX is returned.

| Lock Type   | Lock Period | Mining Multiplier | Maturity Burn | Returned STONX | Cooldown |
| ----------- | ----------- | ----------------- | ------------- | -------------- | -------- |
| Flexible    | None        | 1.00x             | 0%            | 100%           | 7 days   |
| Short Lock  | 90 days     | 1.05x             | 2.5%          | 97.5%          | None     |
| Medium Lock | 180 days    | 1.12x             | 5%            | 95%            | None     |
| Long Lock   | 365 days    | 1.25x             | 10%           | 90%            | None     |

If the amount of STONX staked by user *i* is *s*<sub>*i*</sub>, and the depreciation rate according to the lock-up period is *δ*<sub>*i*</sub>, then the amount of STONX burned at maturity (*M*<sub>*i*</sub>) is defined as follows.

$$
M\_i = s\_i \times \delta\_i
$$

The amount of STONX returned (*R*<sub>*i*</sub>) is as follows.

$$
R\_i = s\_i - M\_i
$$

This structure provides higher Mining Power to long-term participants while also reflecting the cost of using mining resources. In other words, users can choose longer lock-up periods to gain higher mining speed, but must accept higher depreciation burns at the end of the lock-up.

Long-term lock-up is not mandatory. Users who do not want STONX burn burden can choose the Flexible method. Long-term lock-up is an optional structure for participants who want higher Mining Power, and depreciation is interpreted as the cost of using digital mining resources that comes with that choice.

The developer believes this structure should be interpreted not simply as a penalty, but as “depreciation caused by the use of digital mining equipment.” Just as real mining equipment wears out over time, STONX in CryptoStone provides Mining Power while deposited in mining pools, and a portion is burned according to the usage period.


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