Usage of TrustScan's Sybil Score

The queryRiskSummaryScore API accepts an EOA address and Chain ID as input. It responds with an overall Sybil score and sub-scores for the specified address on that blockchain. This document explains the API's output Sybil score and provides data-driven guidance on how to interpret and use the score.

The Value of Sybil Score

The output Sybil score has the value ranged from 0 to 100, where the higher the score, the more Sybil risk of the addresses. Besides, there are two negative integers -2 and -1 of the score to indicate two corner cases. We explain the value in the following table.

sybilRiskScore	sybilRiskLevel	Explanation	Recommendation (Non-Sybil Account Verification)
-2	Unknown	Out of scope for TrustScan's Sybil analysis due to insufficient on-chain activity.(With fewer than 3 transactions, TrustScan does not have enough behavioral data points to make a reliable risk assessment.)	False
-1	No Risk	High Value addresses，No apparent Sybil risk detected by TrustScan(Some hub addresses and their connected addresses exhibit high volumes of activity and interactions, leading them to be accessed as high value accounts.)	True
0 - 60	No Risk	No signs of Sybil risk detected	True
60 -80	Low	LOW Sybil risk detected	False
80 - 90	Medium	MEDIUM Sybil risk detected	False
90 -100	High	HIGH Sybil risk detected	False

Distribution Analysis

To analyze the distribution of risk scores, we conducted a simulation encompassing all active addresses that had at least one on-chain interaction between July 6, 2023 and August 6, 2023. During this period, a total of 5,140,742 unique addresses were active and scored. The full distribution of risk scores is as follows:

sybil_score_bin	addr_cnt	ratio	Recommendation (Non-Sybil Account Verification)
-2	4,515,395	87.84%	False
-1	469,903	9.14%	True
[0, 40]	15,216	0.30%	True
(40, 60]	9,107	0.18%	True
(60, 80]	28,591	0.56%	False
(80, 90]	10,644	0.21%	False
(90, 100]	91,886	1.79%	False

If all 5 million active addresses applied for TrustScan's Non-Sybil Stamp, our analysis indicates that approximately 494,226(=469903+15216+9107) addresses or 9.62% would qualify for issuance.