{
  "manageEntity": {
    "action": "Save",
    "entityId": "554431",
    "entityType": "Track",
    "nonce": "0x8f104fa4b0e15571bac9707f30fa3aa5366fffe86858fbdfe358183286759400",
    "signature": "0x0a24e6f2bd94377fcd395feb586b5eeb935babb3c40e977ce7f20c0ae29608110cc80311eee87e5d6af37aadc2110378db02305cad3ca702d4056726d3e5f8961c",
    "signer": "0xbE2860E3A43979e604Faf88CAEC0E4210F7b3Dac",
    "userId": "128910477"
  }
}