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More details on initial research: 

Problem

Integrations with different tools from Blockchain ecosystem required additional changes in Iroha 1.0 and Михаил Болдыревwith Andrei Lebedevhad to build more levels of abstractions to support them.

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The idea behind DM or HL Transact is to decouple business logic from the blockchain. It will allow to run Iroha with a subset of ISIs required for a specific deployment, or solely with Burrow EVM, or WASM as business logic layer, for example.

Solution

A data model (further referred to as DM) is a business model abstraction. It may provide interfaces to execute some commands and query some state. A DM implementation is a module that can be attached to an Iroha node. In that case, the set of commands delivered to a DM module is strictly determined by the ledger, which enables to build extensible blockchain applications.

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It also has no Iroha API inside, but it can be added if needed.

Decisions

• Use protobuf schema for Commands and Queries payloadspayloads  Use some schema for Commands and Queries descriptions
• Commands and Queries implementation should align to appropriate interfaces (rollback_block, load_persistent, etc.) in available SKDs?
• Executor makes a decision to proceed with command/query or not

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• No strict requirements to environment is powerful yet dangerous solution
• Solution did not align well with Iroha 2.0 in it's current form

Assumptions

• Clients and Iroha use gRPC or another protocol with Protobuf 
• Custom commands and queries has no obvious API for Iroha

Risks

• Protobuf will not be enough for 3rd party applications and users `[9;7]`
• Powerful environments will require a lot of resources `[9;5]`

Additional Information

• https://docs.rs/transact/0.2.4/transact/#modules