{
  "manageEntity": {
    "action": "Save",
    "entityId": "1938644237",
    "entityType": "Track",
    "nonce": "0x5502bde280ed64b518169a1818c41cb6be7521b4ae589dda70400be9042ea827",
    "signature": "0x1d8d64504cb5e1bb0e3270745b6e5d615e6a699eb3b190046d85842fbba62c5c675b8bebf3a7bc82b2784fce053ba74ae0f04db7427b05e30f2c5a1f09afc0541b",
    "signer": "0xb6B208a8f79b1D88d245afa5aDB0a40d38cd6DD1",
    "userId": "528688046"
  }
}