# Ad Serve Layer Cros collects the ad-creatives and other ad-media content from the advertisers as part of the campaign design. A decentralized storage system is used to distribute the content to the ad-assets (such as holograms, billboards, wall displays) within the games or pulled by the game engines through the ad-serve API. A reference is maintained between the ad-creative's link with a campaign, along with metadata about the size, display formats and fidelity associated with the experience (such as 3D or 2D display). This metadata is used by the ad-assets to finetune the advertising display and experience shown to the end users. For the decentralized storage, the Inter-Planetary File System (IFFS) is the technology of choice being matched with wide coverage provided by a service provider like Cloudflare with their IPFS gateway service. Moving to a truly decentralized ad-serve system sometime in future is top of mind for the Cros team. This will consist of a decentralized content distribution system based on IPFS + protocols like Filecoin/Ceramic to compensate nodes for storage & serving of the ad-content. It will also provide Cros with a strong censorship-resistance which will be balanced with community driven content moderation using token curated registry and other primitives. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.cros.world/ad-platform/ad-serve-layer.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.