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Create data-flow.md

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Deirdre Connolly 2020-06-29 21:06:27 -04:00 committed by Henry de Valence
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- Started in `ProcessNewBlock`, `main.cpp:4258`
- Calls `CheckBlock`, defined at https://github.com/zcash/zcash/blob/ab2b7c0969391d8a57d90d008665da02f3f618e7/src/main.cpp#L3930
- Calls `CheckBlockHeader` https://github.com/zcash/zcash/blob/ab2b7c0969391d8a57d90d008665da02f3f618e7/src/main.cpp#L3900
- checks that the block version is not too old
- this requires no information
- checks that the equihash solution is valid
- https://github.com/zcash/zcash/blob/ab2b7c0969391d8a57d90d008665da02f3f618e7/src/pow.cpp#L96
- requires no information except `n`, `k` params
- checks that the proof of work parameters are valid
- requires the current proof of work amount `params.powLimit`
- Checks the Merkle root
- Checks size limits
- Checks that the first transaction is coinbase, and the rest are not
- Calls `CheckTransaction` for each transaction
- Sum up "LegacySigOps" for each transaction and check that it's less than some maximum
- Acquires a lock, then calls `MarkBlockAsReceived` (networking?) and then calls `AcceptBlock`
-