{
  "manageEntity": {
    "action": "Save",
    "entityId": "728365",
    "entityType": "Track",
    "nonce": "0xe825e16a9d0bba7109a742a07c3a9f3eb41848ca370f8149783a21a0627ac95a",
    "signature": "0xd0af3ca38cd583c162e749af44e14cce5b8e14f6e70a354bb27a75055f86fe3143231d9f629eca952ba17a0d5a5b57bfebdb737931a1a4a51f1262eb7ec3d4db1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}