/**
 * Returns whether an address is on the Bitcoin mainnet.
 *
 * @param address - The address to check.
 * @returns `true` if the address is on the Bitcoin mainnet, `false` otherwise.
 */
export declare function isBtcMainnetAddress(address: string): boolean;
/**
 * Returns whether an address is on the Bitcoin testnet.
 *
 * @param address - The address to check.
 * @returns `true` if the address is on the Bitcoin testnet, `false` otherwise.
 */
export declare function isBtcTestnetAddress(address: string): boolean;
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