# Sybil Report on Gitcoin Grants Rounds 10 ###### tags: `gitcoin` `Reports` :::info Updated by December 2021 ::: *Authors: Danilo Lessa Bernardineli* This doc reports how the Gitcoin Contributions Graph changes when it is modified so that users are excluded based on a list provided by the Sybil Detection Algorithm. Summary statistics and a estimate of the Fraud Tax is computed (as defined at https://hackmd.io/e2mZ9UT7QRGMh5tg6OCXfw). ## Parameters Algorithm Aggressiveness: 20% Matching Pool: 700k USD :::info Algorithm Aggressiveness tunes how much sensitive / specific the flagging model should be. When it is set to 50%, then it will be optimized for accuracy, while closer values to 0% means that it will be optimized for minimizing false detection rate ::: ## Links - Flagged users CSV: https://www.dropbox.com/s/i1ggr53fv3l252a/users-to-shutoff.csv?dl=0 - Match & funding stats per grant: https://www.dropbox.com/s/ezl2ku5nvr2yuhi/r10_grants.csv?dl=0 - R10 Contribs & User data: https://www.dropbox.com/s/8t6tyj79uia9in7/GR10-data.zip?dl=0 ## Summary Statistics Total Contributions (original): 320295 Total Contributions (modified): 320295 ___ Matched Contributions (original): 320295 Matched Contributions (modified): 289417 (90.4% of original) ___ Total Contributors (original): 14203 Total Contributors (modified): 12933 (91.1% of original) ___ Median Contribution Count per User (original): 11.00 Median Contribution Count per User (modified): 11.00 ___ Mean Count (original): 22.55 Mean Count (modified): 24.77 (109.8% of original) ## Grant Statistics Total Grant Funding (original): 700000.00 Total Grant Funding (modified): 700000.00 ___ Mean Grant Funding (USDT, original): 772.63 Mean Grant Funding (USDT, modified): 776.91 ___ Median Grant Funding (USDT, original): 0.48 Median Grant Funding (USDT, modified): 0.51 ___ Grant count (original): 906 Grant count (modified): 901 ___ ## Fraud tax Max payout (USDT): 714394.79 ___ **Fraud Tax: 14,394.79 USD** **Taxation Quotient: 2.05%** ___ ## Notes from 2021-12-22 Samples = 94 (34 true) Estimated Sybil Incidence: 36.2% (between 26.1% and 45.4% 95% CI)