{
  "manageEntity": {
    "action": "Save",
    "entityId": "771506160",
    "entityType": "Track",
    "nonce": "0x57dba603766e12ed203537c1490a05de4d4e7a084286f3d7dc2b9b92de47f498",
    "signature": "0x8d1b53fb36413e38364cf2118762bf675cb88ddd99b3f1f58196cca612d696da7e7dcdc2280ae65aa44664011ac559c1dd519470df7304246c41f3037c2a43261c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}