{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xbe2c4f5ce99402fb312d8e85188dff98cf79ad0da02f7a84cc7d6896b2abc7fb",
    "signature": "0x836c4e3acbc900deeecdf8965ab1840a30676df29b3bb05c3452d8a3c577f9033735bf1f072841ed75491e70dc93f1f0b299399d8890c2faf5beda510389e0cd1c",
    "signer": "0xD0c621D41285D82d797AABd11c9CFc584C29f0ED",
    "userId": "940797535"
  }
}