docs: async def replace_keys_start(wallet_handle: int,
                               did: str,
                               identity_json: str) -> str:
      """
      Generated new keys (signing and encryption keys) for an existing
      DID (owned by the caller of the library).
  
      :param wallet_handle: wallet handler (created by open_wallet).
      :param did: signing DID
      :param identity_json: Identity information as json. Example:
          {
  	        "seed": string, (optional) Seed that allows deterministic key creation (if not set random one will be created).
  	                                   Can be UTF-8, base64 or hex string.
              "crypto_type": string, (optional; if not set then ed25519 curve is used;
                        currently only 'ed25519' value is supported for this field)
          }
      :return: verkey
      """
  
      logger = logging.getLogger(__name__)
      logger.debug("replace_keys_start: >>> wallet_handle: %r, did: %r, identity_json: %r",
                   wallet_handle,
                   did,
                   identity_json)
  
      if not hasattr(replace_keys_start, "cb"):
          logger.debug("replace_keys_start: Creating callback")
          replace_keys_start.cb = create_cb(CFUNCTYPE(None, c_int32, c_int32, c_char_p))
  
      c_wallet_handle = c_int32(wallet_handle)
      c_did = c_char_p(did.encode('utf-8'))
      c_identity_json = c_char_p(identity_json.encode('utf-8'))
  
      verkey = await do_call('indy_replace_keys_start',
                             c_wallet_handle,
                             c_did,
                             c_identity_json,
                             replace_keys_start.cb)
  
      res = verkey.decode()
  
      logger.debug("replace_keys_start: <<< res: %r", res)
      return res