> ## Documentation Index
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# Crypto 2a delta risk position double sums

<Badge color="gray" size="lg">[sbm](../tags/sbm)</Badge>

|                                      |                                                                                                                                             |
| ------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------- |
| **Description**                      | The sum of cross products of the weighted sensitivities under the square root in the bucket-level charge formula                            |
| **Hierarchies required in the view** | [Crypto 2a Delta Double Sums](./crypto-2a-delta-double-sums), [Crypto 2a Buckets](./crypto-2a-buckets)                                      |
| **Reference**                        | [\[SCO60.77\]](https://www.bis.org/basel_framework/chapter/SCO/60.htm?inforce=20260101\&published=20241127#paragraph_SCO_60_20260101_60_77) |
| **Formula**                          | $\displaystyle \sum _{k\in b}\sum _{l\in b}\cdot WS_k \cdot WS_l$                                                                           |