# Introduction to MoC

Money On Chain is a suite of smart contracts whose purpose is providing:

* A bitcoin-collateralized stable-coin, Dollar On Chain, (DoC)
* A passive income hodler-targeted token, BitPro (BPRO)

The rationale behind this is that deposits of RBTC help collateralize the DoCs and BitPro absorbs the USD-BTC rate fluctuations.

Note in this tutorial we will use BTC and RBTC as interchangeable terms, as there is a 1:1 peg guaranteed by the RSK network, but in all the cases we mean RBTC as this is the correct coin of the RSK token.

MoC system is a network of cooperative smart contracts working together to ultimately provide a US dollar pegged ERC20 Token (DoC). In this sense, the contracts we can categorize them into 4 categories:

* *MoC state Contracts*: They keep MoC state variables and logic (MoC, MoCState, MoCBucketContainer, MoCSettlement)
* *MoC pure logic Contracts & Libraries*: Functional extensions of the above merely to have responsibility separation and contracts size (aka deploy fee) low. (MoCHelperLib, MoCLibConnection, MoCConverter, MoCExchange, MoCConnector, MoCBProxManager, MoCInrate, MoCWhitelist, MoCBase)
* *Tokens*: Tokens backed by the system (OwnerBurnableToken, DocToken, BProToken, MoCToken)
* *External Dependencies*: External contracts the system relies on, in this case the Oracle or price provider; this could evolve independently of MoC system as along as the interface is maintained. (PriceProvider)

Also you can read official information about [MoC architecture and Money on Chain's smart contracts](/main-rbtc-contract/readme.md)


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