Sybil / Duplicate Account Scorer

A tuned risk score combining shared payout instruments, device and network overlap, timing correlation and behavioural similarity into a single number with an explanation.

Exact matching on email or IP is the usual approach and it catches only people who are not trying.

Returns WHY, not just a score. A duplicate-account decision that cannot be explained cannot be appealed, and an unappealable automated decision is a support burden and a legal problem at the same time.

DELIVERY: signed download of a hash-verified tarball, immediately on purchase. Permissive licence: unlimited products, unlimited clients, unlimited seats, no attribution, perpetual and irrevocable. One restriction, do not republish the source as source.

Interface

What you call, and what comes back. Types and signatures only — the implementation ships with the source.

  export function sybilScore(s: SybilSignals):;
  export function hammingHex(a: string, b: string): number;
  export function isNearDuplicate(hashA: string, hashB: string, threshold = 6): boolean;

  export type SybilVerdict = "ok" | "suspect" | "block";