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Contributing to the Perpetual Powers of Tau ceremony using snarkjs

Most contributions to the Perpetual Powers of Tau (PPOT) ceremony have been performed using the phase2-bn254 codebase, written in Rust.

With the release of version 0.3.0 of snarkjs, it is now possible to contribute to PPOT using a different codebase. Doing so will increase confidence in the security of the ceremony.

Instructions for each participant

The instructions are very similar to those described here.

  1. Install Node version 14

We recommend that you use nvm to set your Node version.

  1. Clone and set up snarkjs
git clone [email protected]:iden3/snarkjs.git &&
cd snarkjs &&
npm i &&
cd ..
  1. Download the challenge_nnnn file from the coordinator. The filename might be something like challenge_0004. Rename it to challenge:
mv challenge_nnnn challenge

Also check with the coordinator (or this repository) for the expected Blake2b hash of challenge.

  1. Run the computation. Note that you should replace <RANDOM TEXT> with random text of your choice. You should try to provide as much entropy as possible from sources which are truly hard to replicate. See this link for examples derived from Zcash's own ceremony.
LOG=debug node snarkjs/build/cli.cjs powersoftau challenge contribute bn128 <PATH_TO_CHALLENGE> response -e="<RANDOM TEXT>"

The output will include a lot of debug messages. They will give you a sense of the progress of the computation. When the process is complete, something like the following will be present in the output:

[INFO]  snarkJS: Claimed Previous Response Hash:
                786a02f7 42015903 c6c6fd85 2552d272
                912f4740 e1584761 8a86e217 f71f5419
                d25e1031 afee5853 13896444 934eb04b
                903a685b 1448b755 d56f701a fe9be2ce
[INFO]  snarkJS: Current Challenge Hash:
                33936051 18d83c21 a2a1763b ec8ebf7a
                6076c754 6b4bbf01 e35e71fa ad0214cf
                18fa19b6 053dfd11 02454d05 754b1b21
                873da78e 0d5d66be 1f74169d e3963011
[INFO]  snarkJS: Contribution Response Hash:
                8ba86472 b1dd715b 5cb64cfa c4648d5a
                96824da3 9ce52245 fc39e395 2af39cd1
                a78ef043 bc2389c1 33dc41a4 33345351
                eebbece7 73a273a6 d6b35fcb becc10bd

Once you are done, upload the response file to the coordinator's server using SFTP or rsync. We will provide you with options and guidance on how to do this.