{
  "manageEntity": {
    "action": "Save",
    "entityId": "539821027",
    "entityType": "Track",
    "nonce": "0xe34a182e72c89a76e4308e0eb78b8422ab7a7d158fe2bab397a6a9e657af1aa5",
    "signature": "0xa9552b96999a6afb411938485b74c885f808389df643d89fc1472deff30ebf665fec8a7af1ffeb2b4300873b5d6a7ca13914e26e1fa2ea463e21abba702313891c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}