{
  "manageEntity": {
    "action": "Save",
    "entityId": "1490055706",
    "entityType": "Track",
    "nonce": "0x63420c017ad2a792f5be253660e10eaf2ad4c572636ed37de9cd37a6b14b3c24",
    "signature": "0xf4c18aa8b26412fc2994fb86f3a25f95cb960e92b016fccc0cb93c782186b0dd1ba1073f65721287efcafaee5d4243e14361565ec6e4f25b49e5a86a68238b481b",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}