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From outside the blockchain
The logic of the Money on Chain platform is developed with smart contracts that run on the RSK blockchain. To interact with this kind of technology, we developed a dApp (decentralized application), which is a web or mobile application that invokes the functions of the smart contracts.
You can find tutorials about developing dApps in the following resources:
The web3 library is one of the most popular to invoke the functions of smart contracts and there are different projects to use them with
We use web3.js and truffle in this tutorial.
An RSK smart contract is bytecode implemented on the RSK blockchain. When a smart contract is compiled, an ABI (application binary interface) is generated and it is required so that you can specify which contract function to invoke, as well as get a guarantee that the function will return the data in the format you expect. The ABI in JSON format must be provided to web3 to build decentralized applications.