{
  "manageEntity": {
    "action": "Save",
    "entityId": "678196796",
    "entityType": "Track",
    "nonce": "0x99ae3a65e4aedb03580df359a445f8a2b344e5625f9544389fe2bf93f78a671b",
    "signature": "0xcf1a58fd29c01b95a2c43d8d0ad8f0b1b1b7f84715ecbb2a19fc55c49f6be86a40a2cb1e74b1f5f6dbab1831afecda4a16c3f010b8d3cef4d1ae72f8816933ab1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}