# Overview

The Contract Open Standard is a smart contract specification defined by the Relation Protocol. It has two basic requirements:

* The contracts should conform to the data format and interface specification defined by the [Open Standard API](/protocol/open-standard-api/introduction.md).
* The RDF data constructed by these contracts should conform to the [Schema Standard](/protocol/schema-standard/overview.md).

Relation Protocol defined a set of Base Contracts based on the Contract Open Standard to address the three following scenarios.

**Identity**: Describe users' identity via SBT contracts.

* Name Service contract

**Relationships**: Describe connections between different users via SBT contracts.

* Follow
* DAO

**Publication**: Describe users' public or privacy content published via SBT contracts.

* Content
* Privacy Content

<figure><img src="/files/kViKB9C5boZkjib5jUKY" alt=""><figcaption><p>Figure 5-1 Base Contracts</p></figcaption></figure>


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