{
  "manageEntity": {
    "action": "Save",
    "entityId": "1145272831",
    "entityType": "Track",
    "nonce": "0x580cbf8725c846bcfae3b8f0683e740100cc1b1507e386f18222beeb3b3f381a",
    "signature": "0x8abc00b1c6cfcb104942aa1cae3b7d16536198f13b90fd6030003259e12f1dfa7875ba07f60669d3e78875ad1bd335b0d2d7c730f4c1bf59e96b3ffe8c99ccf41c",
    "signer": "0x44Fe9338D9d1405927C73FDA0be0F36ae481Cd39",
    "userId": "983568397"
  }
}