> ## Documentation Index
> Fetch the complete documentation index at: https://docs.activeviam.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Data model (core)

This section describes the data used for the Crypto 2a calculations, including how the data is structured.

For Crypto 2a delta and curvature, the **Crypto asset and exchange** (Underlying) refers to the distinct crypto asset [SCO60.73](https://www.bis.org/basel_framework/chapter/SCO/60.htm?inforce=20230101\&published=20191215#paragraph_SCO_60_20230101_60_73) and the corresponding exchange [SCO60.74](https://www.bis.org/basel_framework/chapter/SCO/60.htm?inforce=20230101\&published=20191215#paragraph_SCO_60_20230101_60_74).\
For Crypto 2a vega, the **Crypto asset** (Underlying) refers to the distinct crypto asset [SCO60.73](https://www.bis.org/basel_framework/chapter/SCO/60.htm?inforce=20230101\&published=20191215#paragraph_SCO_60_20230101_60_73) without any differentiation by the exchange [SCO60.75](https://www.bis.org/basel_framework/chapter/SCO/60.htm?inforce=20230101\&published=20191215#paragraph_SCO_60_20230101_60_75).

The **[Risk Factor](./risk-factor)** is used to identify [sensitivities](./sensitivities).
However, it is not used directly in the calculations.
Instead, the **[Underlying](./underlying)** (generated from the **Bucket** and the **Location** for delta and curvature, and from the **Bucket** alone for vega) and tenor fields are used (as appropriate for the risk-measure).
This means that multiple **Risk Factor Names** may be used for the same risk-factor.