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Minor docs cleanup (#2472)
* docs: link consensus to blockchain spec. closes #2422 * docs: deprecate research section. closes #2401 * docs: fix some links * docs: fix some markdown lists * docs: fix more links
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# On Determinism
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Arguably, the most difficult part of blockchain programming is determinism - that is, ensuring that sources of indeterminism do not creep into the design of such systems.
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See [Determinism](../spec/abci/abci.md#determinism).
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# Transactional Semantics
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In [Using Tendermint](../tendermint-core/using-tendermint.md#broadcast-api) we
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discussed different API endpoints for sending transactions and
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differences between them.
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See details of the [broadcast API](../tendermint-core/using-tendermint.md#broadcast-api)
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and the [mempool WAL](../tendermint-core/running-in-production.md#mempool-wal).
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What we have not yet covered is transactional semantics.
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When you send a transaction using one of the available methods, it first
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goes to the mempool. Currently, it does not provide strong guarantees
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like "if the transaction were accepted, it would be eventually included
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in a block (given CheckTx passes)."
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For instance a tx could enter the mempool, but before it can be sent to
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peers the node crashes.
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We are planning to provide such guarantees by using a WAL and replaying
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transactions (See
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[this issue](https://github.com/tendermint/tendermint/issues/248)), but
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it's non-trivial to do this all efficiently.
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The temporary solution is for clients to monitor the node and resubmit
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transaction(s) and/or send them to more nodes at once, so the
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probability of all of them crashing at the same time and losing the msg
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decreases substantially.
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