{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xe2512f43333e04263067d7e5ae593a06ff11cf2e858a5f977769438797aa14b1",
    "signature": "0xaa0b8756a1914800993e587f9180b514072f83a161b964c570b0cc745c0cba0f2692f03638f5e322aa4f17200e6f7420c5740b286e961366a5a4594e6c90b0de1b",
    "signer": "0x4D040D6DF64f27D5075003520f79418826dD6014",
    "userId": "310855216"
  }
}