{
  "manageEntity": {
    "action": "Save",
    "entityId": "147304",
    "entityType": "Track",
    "nonce": "0x9694e3c741e8fa6475d9fcee6263ca31c882cc4a9e3c5abf3323c86bb75753e3",
    "signature": "0x7863e7496c5900c23a2b66d0a6862ec52bfe833205c9df6e1397e0c6ed5e001f5bc14517f3b7b5848aa400eda31a4f0bba22b74fb5d85dc2af9f6c71ea601ca31c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}