{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb15f184b982725394f173a95bc7e7ad3291e6deaff408db0bead37b70659f1a0",
    "signature": "0x8261fea2f2ca2968aee9d5474504b9cd688c73cf22892b539445be4d4475af951f34fbf3f44f31e6395dd44da73e24de63627430b70663c74eda43061a3f3f011c",
    "signer": "0x399f60970750028d6AEE8Cd89FB22768d383B3F2",
    "userId": "128114836"
  }
}