/**
 * NFT holder verification for whitelist eligibility.
 *
 * Checks on-chain Milady NFT ownership (ERC-721 balanceOf) to determine
 * whitelist eligibility. Verified addresses are stored in the same
 * whitelist.json used by twitter-verify.ts, so both paths feed the
 * same Merkle tree for on-chain whitelist proofs.
 *
 * OG Milady Maker: 0x5Af0D9827E0c53E4799BB226655A1de152A425a5 (Ethereum mainnet)
 *
 * @see twitter-verify.ts — parallel verificatio path via Twitter
 * @see drop-service.ts  — mintWithWhitelist() consumer
 */
export interface NftVerificationResult {
    verified: boolean;
    balance: number;
    contractAddress: string;
    error: string | null;
}
/**
 * Check if a wallet address holds at least one Milady NFT.
 *
 * Makes a single `balanceOf()` call to the Milady contract on Ethereum
 * mainnet. This is a read-only view call — no gas, no signing required.
 */
export declare function verifyMiladyHolder(walletAddress: string): Promise<NftVerificationResult>;
/**
 * Verify NFT ownership and add to whitelist if eligible.
 *
 * This is the main entry point called by the API route. It performs the
 * on-chain check and, if successful, writes the address into whitelist.json
 * alongside any Twitter-verified addresses.
 */
export declare function verifyAndWhitelistHolder(walletAddress: string): Promise<NftVerificationResult>;
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