{
  "manageEntity": {
    "action": "Save",
    "entityId": "902786764",
    "entityType": "Track",
    "nonce": "0x35d385fe9c26d5fa2719465330126dd4035a1b6cbf247238334596f076683e65",
    "signature": "0xb612f0955f3786f03ed8fc3055bf913e15714852c8fee43cd18ea889042b7d615fc77e06a9150388aa66e2af1384320c8fa86258232a41021fff7b6bf2a7fe611b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}