{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xddb4a471979e73f330357552e6044e552a7695dda4ad4216e39634161daba7fe",
    "signature": "0x6c28c23afda177a951e81e2d647fc69ec4c3e46f962d85227cb0809f78afb80309b0cff52a30294bfac407935e43c02cae360c58df55a3e6b5a7e341ca5f4c571b",
    "signer": "0xd9D6DC53CF770DA5DEd7FD513807B4632af2A75d",
    "userId": "454062161"
  }
}