{
  "manageEntity": {
    "action": "Save",
    "entityId": "738126769",
    "entityType": "Track",
    "nonce": "0xc34d464e1a034036f28913c9aef262f0f69f173627d0a96737a26fcd0fc63afd",
    "signature": "0xac74824827b8e272358095532fa4e209bf1d10933faaa2f0bf63babec343626914bf2789c042547f4842b33202e6513bb37ef34d827c569a1a50a96eae3c603a1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}