/**
 * Checks if a string is a valid Ethereum transaction hash.
 *
 * An Ethereum transaction hash should be a 32-byte (64 characters) hexadecimal string
 * prefixed with '0x', totaling 66 characters.
 *
 * @param {string} hash - The string to be checked.
 * @returns {boolean} True if the string is a valid Ethereum transaction hash, false otherwise.
 *
 */
export declare const isTxHash: (hash: string) => boolean;
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