{
  "manageEntity": {
    "action": "Save",
    "entityId": "1308123514",
    "entityType": "Track",
    "nonce": "0x0d1be4dd052239fce1452555081e492dbf93b91e564d83a5a65caceb17acb0c1",
    "signature": "0x75c8f090643cf5d3d1e56e7d459f709a82e442a49f33068dbde96ee3c5c4388d44262c0100b9e6a150a4550402e15345fd915a155a846b683baf0156070dee671c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}