{
  "manageEntity": {
    "action": "Save",
    "entityId": "1661991586",
    "entityType": "Track",
    "nonce": "1792485237702126152",
    "signature": "0xd1470b7b77bf2bf3afc4353527e9b0bcf192c6954a0120e8581902654acedd88375ee508422661a51d962f6e1382e75338a5d1ed8ee38b60d3b903d187f92c231c",
    "signer": "0x1007e09532BE90331E035838A9E2E0700bB9741a",
    "userId": "329513359"
  }
}