{
  "manageEntity": {
    "action": "Save",
    "entityId": "1400108957",
    "entityType": "Track",
    "nonce": "0xac9f0e58aae83b960e530188b3b92a3439ab9e0eade0af4379c100e5210f3439",
    "signature": "0x8b1b0beeec068918fcc758393b69c4110eac3f1092308b3c5dfc1ec0d918cf7662c69baadb491e87596909822e5483c3cb4d1075fe1647e32faaf85fc740ce541b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}