/**
 * Copyright (c) 2018-2023, BOTLabs GmbH.
 *
 * This source code is licensed under the BSD 4-Clause "Original" license
 * found in the LICENSE file in the root directory of this source tree.
 */
/// <reference types="bn.js" />
import type { AssetDidUri, CTypeHash, IDelegationNode, IPublicCredentialInput, IPublicCredential, DidUri, HexString } from '@kiltprotocol/types';
import type { Option } from '@polkadot/types';
import type { BN } from '@polkadot/util';
import type { PublicCredentialsCredentialsCredentialEntry } from '@kiltprotocol/augment-api';
export interface EncodedPublicCredential {
    ctypeHash: CTypeHash;
    subject: AssetDidUri;
    claims: HexString;
    authorization: IDelegationNode['id'] | null;
}
/**
 * Format a [[IPublicCredentialInput]] to be used as a parameter for the blockchain API function.

 * @param publicCredential The public credential to format.
 * @returns The blockchain-formatted public credential.
 */
export declare function toChain(publicCredential: IPublicCredentialInput): EncodedPublicCredential;
/**
 * The details of a public credential that are stored on chain.
 */
export interface PublicCredentialEntry {
    /**
     * CType hash of the public credential.
     */
    ctypeHash: HexString;
    /**
     * DID URI of the attester.
     */
    attester: DidUri;
    /**
     * Flag indicating whether the credential is currently revoked.
     */
    revoked: boolean;
    /**
     * Issuance block number of the credential.
     */
    blockNumber: BN;
    /**
     * Authorization information used by the attester when issuing the credential.
     */
    authorizationId: IDelegationNode['id'] | null;
}
/**
 * Decodes the public credential details returned by `api.query.publicCredentials.credentials(subjectId)`.
 *
 * @param encoded The data from the blockchain.
 * @returns The decoded data.
 */
export declare function fromChain(encoded: Option<PublicCredentialsCredentialsCredentialEntry>): PublicCredentialEntry;
/**
 * Retrieves from the blockchain the [[IPublicCredential]] that is identified by the provided identifier.
 *
 * This is the **only** secure way for users to retrieve and verify a credential.
 *
 * @param credentialId Credential ID to use for the query.
 * @returns The [[IPublicCredential]] as the result of combining the on-chain information and the information present in the tx history.
 */
export declare function fetchCredentialFromChain(credentialId: IPublicCredential['id']): Promise<IPublicCredential>;
/**
 * Retrieves from the blockchain the [[IPublicCredential]]s that have been issued to the provided AssetDID.
 *
 * This is the **only** secure way for users to retrieve and verify all the credentials issued to a given [[AssetDidUri]].
 *
 * @param subject The AssetDID of the subject.
 * @returns An array of [[IPublicCredential]] as the result of combining the on-chain information and the information present in the tx history.
 */
export declare function fetchCredentialsFromChain(subject: AssetDidUri): Promise<IPublicCredential[]>;