{
  "manageEntity": {
    "action": "Save",
    "entityId": "685502851",
    "entityType": "Track",
    "nonce": "0x0429ba59585126c6a87674a9d6bef430bde39e11a9a37ce41497e20c9d74647a",
    "signature": "0xd4b3a5518a43c3c5f2ce65d9091d4e614210cc21f00cbaba60c907bd8eea351124bc4908c4af7b4910a92f14baf38a863c83a244a80b123cb93b173413be31cc1b",
    "signer": "0xA66d5981794A5e084FBD9adBFF28F465924fb9a9",
    "userId": "980224167"
  }
}