# Ontology token protocols
## What are the differences between OEP4, OEP5 and OEP8 protocols?
In case you are familiar with Ethereum's `ERC20`, `ERC721`, and `ERC1155` then the quickest way to understand these protocols would be to understand that `OEP4`, `OEP5`, and `OEP8` are correlated to them, respectively.
`OEP4` is a protocol that **homogenizes assets**. Any two assets are **indistinguishable** from each other, but it allows for **multiple units** of an asset.
`OEP5` is a protocol that allows for **non-homogeneous assets** that are **distinguishable** from each other. However, every asset exists as a **unity**.
`OEP8` can be understood as a protocol that is a combination of `OEP4` and `OEP5`. It allows for **multiple** kinds of assets and every asset can have **multiple units**. Thus, within the scope of the contract, similar assets are homogeneous in nature and have the same properties, while different assets are non-homogeneous and have different properties.
## What is the unbinding principle that governs ONG?
The amount of **claimable ONG** at any given point of time = **Amount of ONG unbound per second x ONT possession time x Total amount of owned ONT**
The amount of **ONG** unbound per second: In a decreasing trend - **\[5, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] gradually decreasing every year.**
**ONT** possession time: Current time - **Last recorded time when the ONT balance changed**
Total amount of **ONT**: **1 billion**
For example, account A has a 100 **ONT** balance on day 1, 200 **ONT** on day 2, and 300 **ONT** on day 3, the claimable **ONG** amount for this account is:
**（24×60×60)×5×100/1000000000 + （24×60×60)×5×200/1000000000**
The claimable **ONG** on the basis of the 300 **ONT** balance would be calculated when the next account balance change occurs.
## What is the level of precision that ONT and ONG offer?
The **ONT** quantity is absolute, and thus undividable. **ONG** is precise to 9 decimal places.
## Are there any special addresses with specific utilities?
The three basic contracts on which the token protocols function:
| Name | Address(Hex) | Address(Base58) |
| ---- | ------------ | --------------- |
| ONT | 0100000000000000000000000000000000000000 | AFmseVrdL9f9oyCzZefL9tG6UbvhUMqNMV |
| --- | ---------------------------------------- | ---------------------------------- |
| ONG | 0200000000000000000000000000000000000000 | AFmseVrdL9f9oyCzZefL9tG6UbvhfRZMHJ |
| --- | ---------------------------------------- | ---------------------------------- |
| Governance
Contract
| 0700000000000000000000000000000000000000 | AFmseVrdL9f9oyCzZefL9tG6UbviEH9ugK |
| -------------------------------- | ---------------------------------------- | ---------------------------------- |
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