How to Verify Ownership of a Polymarket Wallet

Ownership is proven by signing a message with the wallet, not by screenshots. Reading a Polymarket wallet needs no permission at all (every account is a public wallet on Polygon); proving you own one requires a cryptographic signature that only the wallet's keys can produce. Signing costs nothing: it is not a transaction, uses no gas, moves no funds, and your private key never leaves the wallet. To read any record first, paste the address into the free Polymarket wallet analyzer, no signup.

Reading vs owning: two different questions

Anyone can read any Polymarket wallet: entry prices, sizes, and resolved outcomes are public on the Polygon chain and the Polymarket Data API, which is what makes the records auditable in the first place. What nobody can do without the keys is sign. So verification runs in one direction only: a reader never needs the owner's permission to check a record, and an owner can always prove a record is theirs by producing a signature. Screenshots prove neither; they only show that a public page exists, which is covered at can you trust a Polymarket PnL screenshot.

The verification flow on Convexly

1. Create a free account and open Settings, then claim the 0x address you control.
2. Convexly issues a single-use challenge message tied to your account and that address. You sign it in your wallet (MetaMask, Rabby, and similar browser wallets).
3. The server checks the signature: for standard wallets it recovers the signer address from the signature (EIP-191 personal_sign); for smart-contract wallets, which cannot sign the EOA way, it asks the contract itself to validate the signature on Polygon (EIP-1271, the standard used by Safe, Argent, and the proxy-style wallets common on Polymarket).
4. A match marks the wallet verified for 90 days, renewable by signing a fresh challenge. Public display is opt-in; verifying does not publish anything by itself.

The mechanics are deliberately conservative: challenges expire and are single-use, a mismatched signature is recorded for audit but never verifies, and the signature flow never asks for funds, approvals, or private keys. Any flow that does ask for those is not a verification flow.

What verification proves, and what it does not

A valid signature proves exactly one thing: the person who signed controls the wallet. It is an identity receipt, not a skill verdict. The skill question runs through the record itself: the realized entry edge with its bootstrap 95% interval against zero, the 30-resolved-position floor, and the concentration screen. Most records honestly read “cannot tell”. On 2026-06-09 we ran our skill read on our own published top-50 cohort; 35 of 50 had enough resolved positions to test; exactly one interval cleared zero on the positive side, roughly what chance predicts across 35 tests at a 2.5% threshold (about 0.9 false positives expected), and it did not survive a multiple-comparisons correction; the full table is at the top-50 skill scan. A verified owner with an unreadable record is still an unreadable record.

Diagnostics on public on-chain records, not investment advice; a past read is not a forecast.