{
  "manageEntity": {
    "action": "Save",
    "entityId": "157412384",
    "entityType": "Track",
    "nonce": "0x1586813192a6a03aab99f34de41053c46adb69806740cd48fab66a22a8da1d17",
    "signature": "0xe6247d667a3ae0ddcad6ac310fea9723829b349527054c8c18f939b1168d248703e8af04afc1a6eac02ceb3dd26c0868c711135c76438d235559bb34e130a2291c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}