{
  "manageEntity": {
    "action": "Save",
    "entityId": "815742103",
    "entityType": "Track",
    "nonce": "0x82e67f076e3bb5b5c3461326e9ae79433fc29b47abd1ffebb52ce267dd39107d",
    "signature": "0x03499d617fd115a54c81debb7e71a4a822c48526df7562f906fe037cdc4f436734d47838878ed515589cd6a78b899d7be837fb7fadfe6c892db3902eea0f86731b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}