{
  "manageEntity": {
    "action": "Save",
    "entityId": "340377",
    "entityType": "Track",
    "nonce": "0x05301a07f811fa9d89be44de4682faecb2b1c2f529a95b0ca20871ed1298f3e3",
    "signature": "0xd2ad7fa4c8531b193e7ad485bc054e0e9d50bdfa7fcad12c65cd927c45934d3150f0ea8248415eb5636ae28404917ef1d18227a678f8b3e02b61bf27147a9f0b1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}