{
  "manageEntity": {
    "action": "Save",
    "entityId": "218377625",
    "entityType": "Track",
    "nonce": "0x612fb5c347b87ebf7a0e5c071c9afade2f39c6150622d5d87519975858f5287d",
    "signature": "0x64bf19d9f08fcbdde3e0de07eb070aba593f66ee631b2f952cd680e1bde86a9062a74865d3662ab6ea7f3040a6a0520dd542c4520ceca59c0b22adf11078617c1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}