import { Hex } from 'viem';
import { OnChainBtcPubkey } from './types';
/**
 * Validate a registry-returned `bytes32` as an x-only BTC pubkey and mint the
 * brand. Checks length, hex form, and secp256k1 curve membership. Returns
 * 64-char lowercase hex without the `0x` prefix.
 *
 * `label` identifies the read site in error messages (e.g.
 * `getOperationBtcKeyAtEpoch (vp=0x…, epoch=0)`), so a failure names which
 * participant and which getter produced it.
 *
 * A zero hash fails the curve check, so an unregistered operator or an epoch
 * with no bonded key surfaces as an error rather than a silent all-zero key.
 */
export declare function assertOnChainBtcPubkey(value: Hex, label: string): OnChainBtcPubkey;
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