{
  "manageEntity": {
    "action": "Save",
    "entityId": "842533",
    "entityType": "Track",
    "nonce": "0x5872e8e5a1fb8903ee791dc9138eef5af07f8ee60264b7528347a68e249ccec7",
    "signature": "0x64634028e878de34c7fa35c8c5a92b53229d3c3f40877be854d6ff80baf1ae9a37a907dcbccc5621cd1d58b731836c48dfad852d90752a7473f7eca02368e4591b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}