{
  "manageEntity": {
    "action": "Save",
    "entityId": "379286",
    "entityType": "Track",
    "nonce": "0x1a86febf9c73a07e374824a2ecff84233264eff3066dbbb822969934f6428d4b",
    "signature": "0x17d0e572546b43fb6d3e1c11273d2ceda01d86c929e14c571a41cd89057405c268a4d8b55907a03d781254651c8112ae15946340649cc5cecaa3e8c20c9c31081c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}