{
  "manageEntity": {
    "action": "Save",
    "entityId": "1550876490",
    "entityType": "Track",
    "nonce": "0x46e67597ff698861f14d8bce82b135d5d19cbbac4ea7c417192c5d28e7fa2f5a",
    "signature": "0x7f2149968299ce16ab4d12b55d2761d06ea9587b5f04f8d4ec8a7c535c22c2e630619d7be7b1e4d0762c9fe1a0af4fa71110e571e9cb74af778ec43ab64d3c531c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}