{
  "manageEntity": {
    "action": "Save",
    "entityId": "1900816973",
    "entityType": "Track",
    "nonce": "0x508c1e7f8ceecd4cd8cadb2369207af9d2e87efac69340d10c91771d1b55b0f2",
    "signature": "0xc11a9b136d0f3413fc18a8538fad1e05b95794a4d6f7d10373d13916d69a16317c14ca8a982d95f1a24fbb9637be27a2025557c66f6e2c77f2bdb5085fa0c2f71c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}