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examples: add one more source of suitable response* files for Groth16

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Turns out that Zcash swiched to BLS12-381 since https://github.com/zcash/zcash/issues/2502,
thanks to @EdgeDLT for pointing that out. I've checked that our
TestCubicCircuit_EndToEnd_Prod test passes with response file downloaded
from the attestations page of Zcash ceremony, thus I propose to put theirs
attestations link before the link to PPoT, because PPoT attestations contain
outdated links and not all responses can be downloaded.

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
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Anna Shaleva 2023-11-28 10:08:43 +03:00
parent fd7b7ffc13
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21
examples/zkp/cubic_circuit/README.md
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@ -31,20 +31,25 @@ to organize the ceremony and generate proving and verifying keys for a circuit.
However, both phases take a significant amount of time and computations to be
performed. Luckily for the developers, it is possible to omit a curve-specific
part of the MPC and reuse the existing results of Phase 1 got from a trusted
source, e.g. from [Powers of Tau ceremony](https://github.com/filecoin-project/powersoftau/)
held by the [Filecoin project](https://github.com/filecoin-project/phase2-attestations#phase1).
source, e.g. from [Zcash PowersOfTau](https://github.com/ZcashFoundation/powersoftau-attestations)
held by the [Zcash Foundation](https://github.com/ZcashFoundation).
`TestCubicCircuit_EndToEnd_Prod` test of the current circuit example demonstrates
how to use the `response` output file from the Phase 1 of the Filecoin's Powers
of Tau ceremony for BLS12-381 curve:
* [`response8`](./response8) file is the response output from the [Powers of Tau ceremony](https://github.com/filecoin-project/powersoftau/)
with the `REQUIRED_POWER` set to 8 (to reduce computations and response file size)
that was run locally with the help of [testing script](https://github.com/filecoin-project/powersoftau/blob/master/test.sh).
* [`response8`](./response8) file is the response output from the ceremony that was run locally
based on the [Filecoin Powers of Tau](https://github.com/filecoin-project/powersoftau/)
with the `REQUIRED_POWER` set to 8 (to reduce computations and response file size).
The ceremony itself was run with the help of [testing script](https://github.com/filecoin-project/powersoftau/blob/master/test.sh).
To get the response file for a production environment, the user has two options:
1. Organize his own ceremony with required number of powers following the
[guide](https://github.com/filecoin-project/powersoftau/tree/master#instructions)
from the source repo.
2. Download the existing suitable `response` file from the
[attestations page](https://github.com/arielgabizon/perpetualpowersoftau#perpetual-powers-of-tau-for-bls381).
from the ceremony source repo.
2. Download the existing suitable `response` file from the trusted existing ceremony.
Please, be careful while choosing `response` file and ensure that it has enough
powers computed (at least as much as the number of the circuit's constraints requires).
Example of suitable ceremonies:
* Zcash Powers Of Tau [attestations page](https://github.com/ZcashFoundation/powersoftau-attestations) (up to 2^21)
* Filecoin Perpetual Powers Of Tau [attestations page](https://github.com/arielgabizon/perpetualpowersoftau#perpetual-powers-of-tau-for-bls381) (up to 2^27)
* [main_test](./main_test.go) contains the `TestCubicCircuit_EndToEnd_Prod` test
itself and demonstrates how to properly initialize Phase 2 based on the given
response file and make some dummy contributions into it.