{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9ae3f7df699d8d0c098442f48552de97ef8a289897cf130c0ac8c3ed5884d947",
    "signature": "0x6e22fc4243410c56726fb640a3106156cb686bcca25d98ba31527507dc297c167cf1e886a84fa4d99ebb38a860d60de4834bfbe78200669bd12e9b0a43e06ce71b",
    "signer": "0x4B140b61EB41438Cda0Dd10473ad1334309C1b97",
    "userId": "45511108"
  }
}