post
https://api-sandbox.urbanpayx.com/api/v1/screening/wallet-ownership/challenge
Start a wallet ownership proof
Mints a single-use challenge for a self-hosted (unhosted) EVM wallet. The
end user signs the returned message verbatim with their wallet
(EIP-191 personal_sign — no gas, nothing broadcast on-chain); the
signature is then submitted to the verify endpoint. The nonce expires
shortly and is bound to this account and address.
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