/**
 * Test-support BIP-322 "simple" P2WPKH signer.
 *
 * Produces the consensus-encoded two-item witness `[DER sig ‖ 0x01,
 * compressed pubkey]` that a Native SegWit software wallet returns for
 * `signMessage(..., "bip322-simple")`. The virtual to_spend/to_sign
 * construction follows the `bip322` crate 0.0.10 (`util.rs:18-85`) — the
 * same reference the production verifier
 * (`tbv/core/clients/vault-provider/auth/bip322Verify.ts`) mirrors, and
 * the BIP-322 official vectors pin.
 *
 * Conscious call: `./testing` deliberately depends on the Bitcoin stack
 * (bitcoinjs-lib was already in this entry's graph via MockBitcoinWallet;
 * tiny-secp256k1-asmjs is new here) — out of scope for the CLAUDE.md §9
 * optional-BTC split.
 *
 * Test-only: never feed real key material to this module.
 */
/**
 * Sign `messageBytes` as a BIP-322 "simple" P2WPKH proof with `privateKey`
 * and return the consensus-encoded two-item witness
 * (`0x02 ‖ len ‖ sig ‖ 0x21 ‖ pubkey`).
 */
export declare function signBip322P2wpkhWitness(messageBytes: Uint8Array, privateKey: Uint8Array): Uint8Array;
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