{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x24400131b5a17285b9e027842f794daac7c5d97f3b8a3c15c96e6d6d6b20f61d",
    "signature": "0x80a0d892bd1d39674bfa498ba7395da969907dfa7dc183070dee030388b4107b67390138a0f72c2629483cb7e6b6535b92eede0dd5b415076ea96fce17b895971c",
    "signer": "0x1A1e870176Bc1918E3015CdE0B874e2E25d9FD22",
    "userId": "80021193"
  }
}