import { Hex } from 'viem';
/**
 * Calculate Bitcoin transaction hash
 *
 * This matches the contract's BtcUtils.hashBtcTx() implementation:
 * 1. Double SHA256 the transaction bytes
 * 2. Reverse the byte order (Bitcoin convention)
 *
 * The resulting hash is used as the unique vault identifier in the BTCVaultRegistry contract.
 *
 * @param txHex - Transaction hex (with or without 0x prefix)
 * @returns The transaction hash as Hex (with 0x prefix)
 */
export declare function calculateBtcTxHash(txHex: string): Hex;
//# sourceMappingURL=btcTxHash.d.ts.map