{
  "manageEntity": {
    "action": "Save",
    "entityId": "760751",
    "entityType": "Track",
    "nonce": "0xf1938a0ffe2ac4d88a022f49b6faf2a18e3cc6c1d9b97fd5759b225ecc74e400",
    "signature": "0xaff251780dc51149e6d3391bcf8b4e82b1f46911f87f86ac007d4b17cbe36b7124bfe6bf426601ea14fd1591c8854d31b3e4341f002c3d802200e212319861771c",
    "signer": "0x7848c1438a663A70aF2A2B1e61f7A9229dcc818e",
    "userId": "490080902"
  }
}