setPortraitHashAsDelegate()

  /**
   * Set a User Portrait as delegate
   * @param {UserPortraitAddress | UserPortraitENSName} identity - The identity of the user that the user would like to set a Portrait for.
   * @param {string} hash - The hash of the User Portrait that the user would like to set.
   * @param {number} blockNumber - The block number that the user would like to set the Portrait for.
   * @param {string} signature - The signature of the user that the user would like to set a Portrait for.
   *
   * @remarks
   * Wallet required.
   *
   * @returns {Promise<ethers.ContractTransaction>} - The transaction object, which contains the transaction hash.
   *
   * @throws {Error} - Will throw an error if the identity is not a valid address or ENS name.
   * @throws {Error} - Will throw an error if the signature is not valid.
   */
  setPortraitHashAsDelegate(
    identity: UserPortraitAddress | UserPortraitENSName,
    hash: string,
    blockNumber: number,
    signature: string,
  ): Promise<ethers.ContractTransaction> {
    const address = isAddress(identity)
      ? identity
      : this.portrait.defaultProvider.resolveName(identity);

    const wallet = this.portrait.portraitProvider.getSigner();

    const message = ethers.utils.solidityKeccak256(
      ['address', 'uint256', 'string'],
      [address, blockNumber, hash],
    );

    const recoveredAddress = ethers.utils.verifyMessage(
      ethers.utils.arrayify(message),
      signature,
    );

    if (recoveredAddress !== address) {
      throw new Error('Invalid signature');
    }

    return this.portrait.portraitUserContract.setPersonalIpfsCIDByDelegate(
      address,
      hash,
      blockNumber,
      signature,
    );
  }