{
  "manageEntity": {
    "action": "Save",
    "entityId": "494668972",
    "entityType": "Track",
    "nonce": "0xa5f7f1080fa85198dedccdc25e65451bf9b420de0c1c998663b0316c50764772",
    "signature": "0x99dedca3cd055f772822264daa7e26d583b9b6b07792734435faba6b39806886430e4c5e15ec95172bdbe318521070b8fda1a3d104defc482e52843a91f5692c1b",
    "signer": "0xb6B208a8f79b1D88d245afa5aDB0a40d38cd6DD1",
    "userId": "528688046"
  }
}