> For the complete documentation index, see [llms.txt](https://orbit-1.gitbook.io/orbitchainwhitepaper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://orbit-1.gitbook.io/orbitchainwhitepaper/2.-orbit-chain-network/untitled-1-1.md).

# 2.4 Orbit Chain SDK

![(Fig. 4 Blockchain based service layer)](/files/-LsVBD_5Z41HA9RCEeI5)

Definition of service system layer for blockchain (Fig.4 Blockchain based service layer) shows that there are some limitations in providing commercialized service on blockchain.

**Limitations of Single Layer Block Chain Services**

* Synchronizing data on legacy centralized database with blockchain database
* Slow and limited throughput of blockchain client
* Limited blockchain query
* Limited interoperability between various blockchains and centralized services

Orbit Chain will provide the Orbit SDK to commercialize blockchain based services through the following system layers after many trials and bug fix by ourselves.

* Service layers are considered for direct service and user experience
* Provide REST, SOCKET which will support easy, stable and reliable connectivity between centralized legacy services and decentralized blockchain based services.
* Unified API to connect all blockchains by Orbit SDK
* System that can provide a centralized experience without harm to decentralized governance/system
  * JSON RPC wrapper layer
    * Provide lower level standard communication protocol to communicate with various public chains such as Bitcoin, Ethereum, and other chains and support extension and interoperability.
  * Sync module: distributed ledger to RDB
    * Instance syncing multi-database system

![(Fig. 5 Orbit sync module)](/files/-LsVBODIo2_UEGy4PjHR)


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