{
  "manageEntity": {
    "action": "Save",
    "entityId": "1490802726",
    "entityType": "Track",
    "nonce": "0x3ed2b7ba5cf1e8bc7961614f6e8fc3b0dba9a7a258a62f85c58b098309a85f73",
    "signature": "0x1e77c6edcb228dde57e4fddb057c341230389fa99d0c3045e20d25f3c28e7d3b1583e1542e2b8e6a4e1649cac3c7243e4a0569d2dd7a7897669360d0cd62a3d31c",
    "signer": "0x94e0dDC50579175818AaCFBC9aba8B065fEf2a55",
    "userId": "460147282"
  }
}