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In other blockchain platforms, complex smart contract features exist, for example Ethereum Solidity. However, the style of creating a contract, deploying it, and then sending tokens, etc., to the contract to interact with it seems to not only have a lot of overhead, but is itself quite prone to mistakes and attacks. In Iroha we take the approach where we use a simple data model consisting of domains, accounts, and assets, which then can go through various interactions to change their properties. In this way, if someone wants to create some logic involving an asset, for example, an Event trigger can be put on transactions for the asset that matches certain parameters and instructions can be executed on the asset. In this way, ISI works more like database triggers than deployed smart contracts, as in Ethereum.
https://github.com/hyperledger/iroha/blob/iroha2-devwp/iroha_2_whitepaper.md
Problem
Iroha Special Instructions should provide safe, fast and user-friendly way to make development of custom and basic smart contracts easier with Turing complete computations supported in it.
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