{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x44ee8cdb5d2e44ac6bee9f23568b72ce0e8297a742c9f3f18787f46ec63f8e1b",
    "signature": "0x4a14450299272bcbe5c5c9a92757c7f23cc696398c4a57ad32fde2b6213447d44eb81ba4ba532e63ac43e40a8efbcd2f4c58cdbf25ac1a6c19270afed8ef21b11b",
    "signer": "0x1Bd8D1F59efeea4aC492ccaD54406020AB908D80",
    "userId": "666512345"
  }
}