{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x1b78be860cc3a57534672dfba31bf15a9750f1e772b61dcc8be835bea3d5382c",
    "signature": "0x1863159abaf0e50fcc0374ec562fb38adb93ee85d1b8d39e6bf66c3f0f82341363369b97fa2e5dcfccd50af37ea39a2880f09323dc41767c206e7af2151f3f5b1c",
    "signer": "0x258a4Cb700805319F50300ebba72383320582E5D",
    "userId": "737395461"
  }
}