{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x3dea49175ada5932f2068e5ce2e9b6f651231cf50930adf0b3d23a49d873ebfb",
    "signature": "0x9bc71bd67332e0753c83c8db4be85a54a10551e358880b4d71ccf0c73a1a10d711e43be8e65403fc471f6d006603e0f32fdc80de0227f7795e61c078603c66cd1b",
    "signer": "0x6E1669e0b8d73EA38c2C3A7b05EDd44438bD96F7",
    "userId": "159580874"
  }
}