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doc/book: add section on using zkrender tool

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2024-04-10 09:51:32 +02:00
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doc/src/zkas/writing-zk-proofs.md
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@@ -75,3 +75,16 @@ log, and compare it with the public values you see in the `witness.json`
from when the proof was created. This will allow you to pinpoint exactly
where the error occurs.
## Viewing the ZK Circuit Layout
ZK circuit have a layout. The less empty space, the more efficient is your
circuit. Usually it just means reducing the `k` value specified. The number of
rows in your circuit is $2ᵏ$, so reducing the value by 1 will halve the number
of rows.
To generate an image of the circuit layout, simply run:
```
./bin/zkrunner/zkrender.py -w src/contract/dao/proof/witness/exec.json src/contract/dao/proof/exec.zk /tmp/layout.png
```