Owner view
Input is a Zswap coin public key — 32 raw bytes, 64 hex characters, exactly as stored
in the contract's tokenOwner map. It is not an mn_addr…
wallet address and not an mn_dust… address; pasting either of those will never match.
The server cross-checks its scan against the contract's own ownedTokensCount
and answers unknown rather than return a list it cannot vouch for.