{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xe9917bbf3be255c07808cc8f9720ff13212dc4f0c404534200808a29dd6e0428",
    "signature": "0x2906b2805949f5765f68d978a08068c4acff634697df1bd407c141f3a88a758b714ee1bdb2dd71bdcad0eb30276bf256222751407282e75e5b65034f76aa91441c",
    "signer": "0x94A3A277dAA40049Dd2a7f4D56752233ffF3Ce0B",
    "userId": "347578212"
  }
}