/**
 * Challenger derivation utilities — counting local challengers for UI-level
 * validation (e.g. minimum deposit amounts) and deriving the exact
 * local-challenger set a claimer's tx graph is built from.
 */
/**
 * Compute the number of local challengers for a vault.
 *
 * Mirrors the VP's `compute_num_challengers()` logic:
 * local challengers = {vault_provider} ∪ {vault_keepers} − {depositor}
 *
 * Keys are normalized to x-only lowercase hex before comparison, so
 * `0x`-prefixed, compressed, or mixed-case keys are handled correctly.
 *
 * @param vaultProviderPubkey - Vault provider BTC public key
 * @param vaultKeeperPubkeys - Vault keeper BTC public keys
 * @param depositorPubkey - Depositor (claimer) BTC public key
 * @returns Number of local challengers
 */
export declare function computeNumLocalChallengers(vaultProviderPubkey: string, vaultKeeperPubkeys: string[], depositorPubkey: string): number;
/** Roles a claimer can hold; determines which local-challenger rule applies. */
export interface DeriveLocalChallengersParams {
    /** The graph's claimer (VP, a vault keeper, or the depositor). */
    claimerBtcPubkey: string;
    /** Depositor registered on-chain for the vault. */
    depositorBtcPubkey: string;
    /** Vault provider registered on-chain for the vault. */
    vaultProviderBtcPubkey: string;
    /** Vault keepers registered on-chain for the vault. */
    vaultKeeperBtcPubkeys: string[];
}
/**
 * Derive the local-challenger set for a claimer's graph.
 *
 * Byte-for-byte mirror of btc-vault `derive_challengers_for`
 * (`crates/vault/src/tx_graph/graph.rs:257-284`):
 * - depositor-as-claimer → vault keepers only (VP excluded)
 * - VP- or VK-claimer → `({VP} ∪ VKs) − {claimer}`, sorted and deduplicated
 *
 * The protocol guarantees the depositor is not a vault keeper
 * (`TxGraphParams::validate`), so the depositor filter in the first branch is
 * defense-in-depth; it surfaces a clear error if a misconfigured context ever
 * violates the invariant.
 *
 * @throws If no local challenger remains, or (depositor path) the keeper set
 *   contains duplicates — both mean the signing context is misconfigured.
 */
export declare function deriveLocalChallengers(params: DeriveLocalChallengersParams): string[];
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