> For the complete documentation index, see [llms.txt](https://hub.bsvblockchain.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hub.bsvblockchain.org/higher-learning/bsv-academy/bsv-network-topology/essentials-of-overlay-services/integration-with-spv-and-infrastructure-dependencies.md).
# Integration with SPV and Infrastructure Dependencies
All overlay systems within the **Mandala architecture** operate dedicated **Simplified Payment Verification (SPV)** mechanisms, ensuring both validity and scalable integration with the blockchain. Overlay services utilize **Merkle proofs** to verify the authenticity and integrity of transactions without necessitating access to the full blockchain data. This capability allows each overlay network to serve data back to applications with absolute certainty regarding its validity, thereby enhancing performance, scalability, and efficiency.
The infrastructure dependencies for overlay services include:
* **BSV Node Network**: Essential for new header announcements and transaction submissions.
* **Merkle Service**: Facilitates the efficient calculation of Merkle paths, with a scaled Merkle Service set to replace ARC's microservice BlockTx due to the anticipated increase in block sizes.
* **SPV Data Structures**: Widely utilized within wallets and applications to enable a peer-to-peer paradigm.
These dependencies collectively provide a **cost-effective**, **scalable**, and **secure** solution for businesses, ensuring data integrity and network resilience.
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