{
  "manageEntity": {
    "action": "Save",
    "entityId": "741808304",
    "entityType": "Track",
    "nonce": "0x6a4292ef3b33b83ca9ed48eef530847c6b370ca49f29e9066421985e5cfa59b1",
    "signature": "0x2de0993873d726f8261b6c554eb58c0adda465e27844b6a8a3b7e9dd5a961cce542285db9d95c25b1be51110830cad450d5e6dbbd237e331826154ead32f03821b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}