# How to get or redeem?

### How to get bbBNC:

Lock vBNC and receive bbBNC. The bbBNC value is proportional to the amount and duration staked (up to a maximum of 4 years). Each address is associated with a single bbBNC expiry date, and bbBNC can't transfer.

*BNC -> vBNC -> bbBNC*

> The bbBNC value is a key indicator for participating in dividends. Simply put, the higher the proportion of bbBNC value in the overall, the more you might get in various bbBNC holdings benefits.

> Your bbBNC value will decrease over time and will reach zero once the lock duration ends. At this point, your staked vBNC will be unlocked.

| Locking Duration (per vBNC) | bbBNC received |
| --------------------------- | -------------- |
| 3 months                    | 0.296875       |
| 6 months                    | 0.3424         |
| 1 year                      | 0.4375         |
| 4 years                     | 1              |

<figure><img src="https://757947912-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FJFtVsA5N3spWTWKvFvv0%2Fuploads%2FbNznoWtYiRdnK9veXwTP%2Fimage.png?alt=media&#x26;token=05a3114e-e128-483e-87d7-2648d2e5f246" alt=""><figcaption></figcaption></figure>

### Redeem bbBNC to unlock vBNC in advance:

For users who need to unlock bbBNC immediately to retrieve locked vBNC in advance, Bifrost offers a method of early unlocking. However, this comes with a certain slash, <mark style="color:red;">you may LOSE YOUR vBNC PRINCIPLE by early redemption</mark>. The relevant formula is as follows:

> Redemption Slash % = `((Remaining locked blocks + 5,256,000) / 26,280,000)^2`
>
> The vBNC that users can get by unlocking in advance = `Locked vBNC * (1 - Redemption Slash %)`

| Unlock Time left | Unlock Block left | Redeem Immediately Slash |
| ---------------- | ----------------- | ------------------------ |
| 3 Months         | 1,314,000         | 6.25%                    |
| 6 Months         | 2,628,000         | 9.00%                    |
| 1 Year           | 5,256,000         | 16.00%                   |
| 2 Year           | 10,512,000        | 36.00%                   |
| 3 Year           | 15,768,000        | 64.00%                   |
| 4 Year           | 21,024,000        | 100.00%                  |