{
  "manageEntity": {
    "action": "Save",
    "entityId": "1973751375",
    "entityType": "Track",
    "nonce": "0xc0c59289b97a50777696862d8af4e09c9ccae495712a25006cd78d1f1d036cc7",
    "signature": "0x031f9a4aac74a7e2d3ee9a19408b4ca0090a0b94476987e5101ec032520f379c25cc344b17febc132e115a1926e9e25e1d8f6f4f5d73e1c1a247da5ce2cbf5921b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}