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28 lines
1.1 KiB
Markdown
28 lines
1.1 KiB
Markdown
---
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order: 1
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parent:
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title: ABCI
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order: 2
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---
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# ABCI
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ABCI stands for "**A**pplication **B**lock**c**hain **I**nterface".
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ABCI is the interface between Tendermint (a state-machine replication engine)
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and your application (the actual state machine). It consists of a set of
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_methods_, each with a corresponding `Request` and `Response`message type.
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To perform state-machine replication, Tendermint calls the ABCI methods on the
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ABCI application by sending the `Request*` messages and receiving the `Response*` messages in return.
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All ABCI messages and methods are defined in [protocol buffers](https://github.com/tendermint/tendermint/blob/v0.34.x/proto/abci/types.proto).
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This allows Tendermint to run with applications written in many programming languages.
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This specification is split as follows:
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- [Methods and Types](./abci.md) - complete details on all ABCI methods and
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message types
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- [Applications](./apps.md) - how to manage ABCI application state and other
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details about building ABCI applications
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- [Client and Server](./client-server.md) - for those looking to implement their
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own ABCI application servers
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