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How to verify the Celo Plumo Ceremony Phase 1.

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Introduction

Plumo Ceremony had 8 rounds in total. Stored files for the ceremony (available here) follow the pattern round.chunk_id.contribution_number.verifier_id. For example file 1.0.14.0xe9053647d4bba6c53a88d1d012e0cf1af86c049f refers to round 1, chunk ID 0, contribution number 14, verifier ID 0xe9053647d4bba6c53a88d1d012e0cf1af86c049f. You can find references to round 9 in the stored chunks, but round 9 was never officially finalized. Please disregard files related to round 9.

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Preparation

What you will need:
  • Ceremony files, available here.
  • Go verification script, by Consensys, available here.

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Ceremony Files

All Ceremony files are available here. In order to verify a given round, you will need the following:
  • File related to the highest contribution_number for chunk_id 0 for the previous round.
  • Files related to the highest contribution_number for each chunk_id from 0 to 127, for the round you want to verify.
For example, if you want to verify round 8 (previous round would be 7), you will need the following files:
  • 7.0.10.0x097a648556127e742f8c3bbab155ee368f00ca14
  • 8.0.18.0x21c9bdf38a32bbe3d4cbfb81c82b26ae82246296
  • 8.1.18.0x621f62e35ae4cf7c3d672e16227d65263c0796a1
  • 8.2.18.0x877d43c37a1484c76c92fbfa59a9ffc296b021ed
  • 8.3.18.0x7f2137fcc9c08381eff306f6f8138139ad961334
  • 8.4.18.0xdcc3013396a6fc966b911cdcce4984728f71444e
  • 8.5.18.0xf686ca82313c54d36cfa6e88ca86764154e3a097
  • 8.6.18.0x7f2137fcc9c08381eff306f6f8138139ad961334
  • 8.7.18.0x7f2137fcc9c08381eff306f6f8138139ad961334
  • 8.8.18.0x3721615b340294677d0dad4a5454c1785d78b14e
  • 8.9.18.0x7f2137fcc9c08381eff306f6f8138139ad961334
  • 8.10.18.0x21c9bdf38a32bbe3d4cbfb81c82b26ae82246296
  • 8.11.18.0x21c9bdf38a32bbe3d4cbfb81c82b26ae82246296
  • 8.12.18.0x097a648556127e742f8c3bbab155ee368f00ca14
  • 8.13.18.0x3721615b340294677d0dad4a5454c1785d78b14e
  • 8.14.18.0x7188c2cf6ec09a45fe60a79f3c9b98a6924107be
  • 8.15.18.0x7188c2cf6ec09a45fe60a79f3c9b98a6924107be
  • 8.16.18.0xe0e346a8a4f46bfd8c91a5c7ab7b44b71dd8d1dc
  • 8.17.18.0x8a2ffeeb7ab7241c305a39b75231902adff38d0a
  • 8.18.18.0xe0e346a8a4f46bfd8c91a5c7ab7b44b71dd8d1dc
  • 8.19.18.0x877d43c37a1484c76c92fbfa59a9ffc296b021ed
  • 8.20.18.0x21c9bdf38a32bbe3d4cbfb81c82b26ae82246296
  • 8.21.18.0x7188c2cf6ec09a45fe60a79f3c9b98a6924107be
  • 8.22.18.0x877d43c37a1484c76c92fbfa59a9ffc296b021ed
  • 8.23.18.0x21c9bdf38a32bbe3d4cbfb81c82b26ae82246296
  • 8.24.18.0x9fb9983a2cce67496663ad8f6c947c0b164c7bab
  • 8.25.18.0x877d43c37a1484c76c92fbfa59a9ffc296b021ed
  • 8.26.18.0x877d43c37a1484c76c92fbfa59a9ffc296b021ed
  • 8.27.18.0x6862299fa35dde3a9cf7ec1263edc51cb2fc566a
  • 8.28.18.0x621f62e35ae4cf7c3d672e16227d65263c0796a1
  • 8.29.18.0xe0e346a8a4f46bfd8c91a5c7ab7b44b71dd8d1dc
  • 8.30.18.0x8a2ffeeb7ab7241c305a39b75231902adff38d0a
  • 8.31.18.0x621f62e35ae4cf7c3d672e16227d65263c0796a1
  • 8.32.18.0x7188c2cf6ec09a45fe60a79f3c9b98a6924107be
  • 8.33.18.0x7188c2cf6ec09a45fe60a79f3c9b98a6924107be
  • 8.34.18.0x621f62e35ae4cf7c3d672e16227d65263c0796a1
  • 8.35.18.0xf686ca82313c54d36cfa6e88ca86764154e3a097
  • 8.36.18.0xe0e346a8a4f46bfd8c91a5c7ab7b44b71dd8d1dc
  • 8.37.18.0x097a648556127e742f8c3bbab155ee368f00ca14
  • 8.38.18.0x9fb9983a2cce67496663ad8f6c947c0b164c7bab
  • 8.39.18.0xe0e346a8a4f46bfd8c91a5c7ab7b44b71dd8d1dc
  • 8.40.18.0xe0e346a8a4f46bfd8c91a5c7ab7b44b71dd8d1dc
  • 8.41.18.0xe0e346a8a4f46bfd8c91a5c7ab7b44b71dd8d1dc
  • 8.42.18.0x8a2ffeeb7ab7241c305a39b75231902adff38d0a
  • 8.43.18.0x2095c929ec2a37cf57c997331da6cd60b047258a
  • 8.44.18.0x21c9bdf38a32bbe3d4cbfb81c82b26ae82246296
  • 8.45.18.0x7f2137fcc9c08381eff306f6f8138139ad961334
  • 8.46.18.0x877d43c37a1484c76c92fbfa59a9ffc296b021ed
  • 8.47.18.0xdcc3013396a6fc966b911cdcce4984728f71444e
  • 8.48.18.0xdcc3013396a6fc966b911cdcce4984728f71444e
  • 8.49.18.0xdcc3013396a6fc966b911cdcce4984728f71444e
  • 8.50.18.0x877d43c37a1484c76c92fbfa59a9ffc296b021ed
  • 8.51.18.0x21c9bdf38a32bbe3d4cbfb81c82b26ae82246296
  • 8.52.18.0x6862299fa35dde3a9cf7ec1263edc51cb2fc566a
  • 8.53.18.0x8a2ffeeb7ab7241c305a39b75231902adff38d0a
  • 8.54.18.0x621f62e35ae4cf7c3d672e16227d65263c0796a1
  • 8.55.18.0x7188c2cf6ec09a45fe60a79f3c9b98a6924107be
  • 8.56.18.0x9fb9983a2cce67496663ad8f6c947c0b164c7bab
  • 8.57.18.0x7f2137fcc9c08381eff306f6f8138139ad961334
  • 8.58.18.0xe0e346a8a4f46bfd8c91a5c7ab7b44b71dd8d1dc
  • 8.59.18.0x621f62e35ae4cf7c3d672e16227d65263c0796a1
  • 8.60.18.0x21c9bdf38a32bbe3d4cbfb81c82b26ae82246296
  • 8.61.18.0xe0e346a8a4f46bfd8c91a5c7ab7b44b71dd8d1dc
  • 8.62.18.0x7188c2cf6ec09a45fe60a79f3c9b98a6924107be
  • 8.63.18.0x3721615b340294677d0dad4a5454c1785d78b14e
  • 8.64.18.0x3721615b340294677d0dad4a5454c1785d78b14e
  • 8.65.18.0x9fb9983a2cce67496663ad8f6c947c0b164c7bab
  • 8.66.18.0xe0e346a8a4f46bfd8c91a5c7ab7b44b71dd8d1dc
  • 8.67.18.0x21c9bdf38a32bbe3d4cbfb81c82b26ae82246296
  • 8.68.18.0x6862299fa35dde3a9cf7ec1263edc51cb2fc566a
  • 8.69.18.0x2095c929ec2a37cf57c997331da6cd60b047258a
  • 8.70.18.0x877d43c37a1484c76c92fbfa59a9ffc296b021ed
  • 8.71.18.0xf686ca82313c54d36cfa6e88ca86764154e3a097
  • 8.72.18.0x7188c2cf6ec09a45fe60a79f3c9b98a6924107be
  • 8.73.18.0x877d43c37a1484c76c92fbfa59a9ffc296b021ed
  • 8.74.18.0x5f748472f15a02231c869c567d28e3130ed1b46c
  • 8.75.18.0x3721615b340294677d0dad4a5454c1785d78b14e
  • 8.76.18.0x7f2137fcc9c08381eff306f6f8138139ad961334
  • 8.77.18.0x2095c929ec2a37cf57c997331da6cd60b047258a
  • 8.78.18.0xf686ca82313c54d36cfa6e88ca86764154e3a097
  • 8.79.18.0x3721615b340294677d0dad4a5454c1785d78b14e
  • 8.80.18.0x621f62e35ae4cf7c3d672e16227d65263c0796a1
  • 8.81.18.0x877d43c37a1484c76c92fbfa59a9ffc296b021ed
  • 8.82.18.0xdcc3013396a6fc966b911cdcce4984728f71444e
  • 8.83.18.0x7f2137fcc9c08381eff306f6f8138139ad961334
  • 8.84.18.0x621f62e35ae4cf7c3d672e16227d65263c0796a1
  • 8.85.18.0xdcc3013396a6fc966b911cdcce4984728f71444e
  • 8.86.18.0x621f62e35ae4cf7c3d672e16227d65263c0796a1
  • 8.87.18.0xdcc3013396a6fc966b911cdcce4984728f71444e
  • 8.88.18.0x7188c2cf6ec09a45fe60a79f3c9b98a6924107be
  • 8.89.18.0x7188c2cf6ec09a45fe60a79f3c9b98a6924107be
  • 8.90.18.0x877d43c37a1484c76c92fbfa59a9ffc296b021ed
  • 8.91.18.0x621f62e35ae4cf7c3d672e16227d65263c0796a1
  • 8.92.18.0xdcc3013396a6fc966b911cdcce4984728f71444e
  • 8.93.18.0x2095c929ec2a37cf57c997331da6cd60b047258a
  • 8.94.18.0xf686ca82313c54d36cfa6e88ca86764154e3a097
  • 8.95.18.0xe0e346a8a4f46bfd8c91a5c7ab7b44b71dd8d1dc
  • 8.96.18.0xf686ca82313c54d36cfa6e88ca86764154e3a097
  • 8.97.18.0xe0e346a8a4f46bfd8c91a5c7ab7b44b71dd8d1dc
  • 8.98.18.0x5f748472f15a02231c869c567d28e3130ed1b46c
  • 8.99.18.0x7188c2cf6ec09a45fe60a79f3c9b98a6924107be
  • 8.100.18.0xe0e346a8a4f46bfd8c91a5c7ab7b44b71dd8d1dc
  • 8.101.18.0x7188c2cf6ec09a45fe60a79f3c9b98a6924107be
  • 8.102.18.0x877d43c37a1484c76c92fbfa59a9ffc296b021ed
  • 8.103.18.0xf686ca82313c54d36cfa6e88ca86764154e3a097
  • 8.104.18.0x5f748472f15a02231c869c567d28e3130ed1b46c
  • 8.105.18.0xe0e346a8a4f46bfd8c91a5c7ab7b44b71dd8d1dc
  • 8.106.18.0x5f748472f15a02231c869c567d28e3130ed1b46c
  • 8.107.18.0x621f62e35ae4cf7c3d672e16227d65263c0796a1
  • 8.108.18.0x6862299fa35dde3a9cf7ec1263edc51cb2fc566a
  • 8.109.18.0x877d43c37a1484c76c92fbfa59a9ffc296b021ed
  • 8.110.18.0x21c9bdf38a32bbe3d4cbfb81c82b26ae82246296
  • 8.111.18.0x621f62e35ae4cf7c3d672e16227d65263c0796a1
  • 8.112.18.0x2095c929ec2a37cf57c997331da6cd60b047258a
  • 8.113.18.0x6862299fa35dde3a9cf7ec1263edc51cb2fc566a
  • 8.114.18.0x877d43c37a1484c76c92fbfa59a9ffc296b021ed
  • 8.115.18.0x8a2ffeeb7ab7241c305a39b75231902adff38d0a
  • 8.116.18.0x097a648556127e742f8c3bbab155ee368f00ca14
  • 8.117.18.0x21c9bdf38a32bbe3d4cbfb81c82b26ae82246296
  • 8.118.18.0xe0e346a8a4f46bfd8c91a5c7ab7b44b71dd8d1dc
  • 8.119.18.0x2095c929ec2a37cf57c997331da6cd60b047258a
  • 8.120.18.0xdcc3013396a6fc966b911cdcce4984728f71444e
  • 8.121.18.0x3721615b340294677d0dad4a5454c1785d78b14e
  • 8.122.18.0x9fb9983a2cce67496663ad8f6c947c0b164c7bab
  • 8.123.18.0x3721615b340294677d0dad4a5454c1785d78b14e
  • 8.124.18.0x097a648556127e742f8c3bbab155ee368f00ca14
  • 8.125.18.0x21c9bdf38a32bbe3d4cbfb81c82b26ae82246296
  • 8.126.18.0xe0e346a8a4f46bfd8c91a5c7ab7b44b71dd8d1dc
  • 8.127.18.0x5f748472f15a02231c869c567d28e3130ed1b46c

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Go verification script

The Go verification script has some hardcoded numbers and paths:
  • The script expects the files above to exist in a directory ./rounds/ where the main.go file exists. This is defined at line 285 as const roundsRootDir = "./rounds/".
  • The script defines the round number being verified at lines 142 and 196. For example for round 8:
    • Line 142: if err := currChunk.read(8, 0); err != nil { (8 refers to round number 8).
    • Line 196: if err := nextChunk.read(8, i); err != nil { (8 refers to round number 8).
  • Finally, the script also defines the previous round number at line 146. For example, if you are verifying round 8, the previous round is 7 so:
    • Line 146: if err := prevChunkPrevRound.read(7, 0); err != nil { (7 refers to the previous round).

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Executing the Verification Script

Once you have all the necessary files in the correct directory, and the script tailored to the round you want to verify, you can run the script as: 
$ go run . --srs ./<OUTPUT_FILE_NAME>.srs
2025/09/30 07:44:14 opening file 8.0.18.0x21c9bdf38a32bbe3d4cbfb81c82b26ae82246296
2025/09/30 07:44:15 opening file 7.0.10.0x097a648556127e742f8c3bbab155ee368f00ca14
2025/09/30 07:46:23 opening file 8.1.18.0x621f62e35ae4cf7c3d672e16227d65263c0796a1
2025/09/30 07:47:30 opening file 8.2.18.0x877d43c37a1484c76c92fbfa59a9ffc296b021ed
2025/09/30 07:48:39 opening file 8.3.18.0x7f2137fcc9c08381eff306f6f8138139ad961334
2025/09/30 07:49:48 opening file 8.4.18.0xdcc3013396a6fc966b911cdcce4984728f71444e
...
2025/09/30 10:10:38 opening file 8.127.18.0x5f748472f15a02231c869c567d28e3130ed1b46c
2025/09/30 10:11:45 built srs of len 134217728
2025/09/30 10:26:26 done validiting, writing SRS to disk
2025/09/30 10:31:02 done writing SRS to disk
The output file (e.g. ./<OUTPUT_FILE_NAME>.srs) will be a KZG (Kate–Zaverucha–Goldberg) SRS (Structured Reference String) file for the given round. This SRS is “universal”: you can use it in any proving system that requires a KZG commitment setup (Groth16, PLONK, Marlin, etc.), provided it uses the same curve (BW6-761).
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