{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x403118693c2fd9b3f96acd763bcdc9b1f131436e0708b0f63c0abcada82c312b",
    "signature": "0xdfa1e2aa1e505a749ce48a6402a4b52b02056c9fec0bafcac7a2751d15cb4e513fad3c289b0ea2fdb87971facc9a403b8ca1c154551a78c7207458f88b48b3d81b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}