> For the complete documentation index, see [llms.txt](https://wpen.donablock.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wpen.donablock.io/15.-donablock-data-architecture/15-2-reference-data.md).

# 15-2 Reference Data :

<mark style="color:purple;">**Large-Scaled, Frequently-Generated Data**</mark>

Data on DonaBlock corresponding to personal information, rich contents for products and deals(images, video clips, and text), frequently generated user behavior records, etc., are stored on separate distributed repositories such as IPFS or PaaS. (Reference Data) Such additional information can be categorized into merchandise information, customer information, and detail contents data.

Reference Data of each deal is hashed to be linked to respective core data. This enables efficient blockchain network transaction for better user experiences.