{
  "manageEntity": {
    "action": "Save",
    "entityId": "1451554046",
    "entityType": "Track",
    "nonce": "0x72e2d1ff9f20d6398ef8b32eb3d6551f6ff3e22aa23c572be2893961c1b18024",
    "signature": "0xfc1e405a1b7edf8f6087604738ee73356932179547e7ac8ffc9e19841d9e6caa0bee13aa3ae85d4699035d762a075c1fc438c957830618371c7c7618eae577c81c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}