{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb12983db57c9c288eb47aa40c380b17cc1dc9fb09e688ce3a81feffbe5c6d832",
    "signature": "0xdb786e4b50c1a3bf5ebefe76028eff7dde723c5f555e2b1833177d88394f81ec4c728c0cdc69daa39ad13fc0b0f4ddc88b0ab11a3f0eab5252fb271b3f93e9e31b",
    "signer": "0x9a7357063b22Fc98369F72A173b71dFD374eA7d6",
    "userId": "464720762"
  }
}