{
  "manageEntity": {
    "action": "Save",
    "entityId": "1492103290",
    "entityType": "Track",
    "nonce": "0x1a44527f0b6e83fa73c1a4616381d69e933c69e3965070803c0e77639bcf9095",
    "signature": "0xb73e97205e42df6a622840d991c4575b25959d28a628001e9e6c0875bd5604b5759cf428702d9014fc74f1f365f3c28b9df99af769b095709e6009f79741a3a51c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}