{
  "manageEntity": {
    "action": "Save",
    "entityId": "123904",
    "entityType": "Track",
    "nonce": "0x8b2c349c8919240fc8ac9ada89575030255ad63da24faa9b2fc9594da56ca9aa",
    "signature": "0xa973cde4b796a0fb3a5ca26ebd550b8c30ad29c037b084c2478e66b6f0959c105c3c8b01ee02dede3dbb574da645052fb825e5c010a407cc020cfa5c1340a17a1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}