{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x1121316c2c71b87a3829362b14a34bd25b627b7a040ce1a13790d51c84e9b9de",
    "signature": "0x088b443af96340055b4ffa335d85329f28ca85ba9d64be3a87444856617031a64ef65d6f7232b22f16a229c74abf081e1dd0a887499e32f03f2a884759edce521b",
    "signer": "0xd7fD278e39f433974953D50A37B02EAC55eFC678",
    "userId": "230922729"
  }
}