{
  "manageEntity": {
    "action": "Save",
    "entityId": "480250",
    "entityType": "Track",
    "nonce": "0x4442f9488e53f041ba0270111e58e037b1295a4fb9cb69ab7c376d90299c21dc",
    "signature": "0xe178556fd668551281863750bf12e41c3bece62e3f2cbdec28390a02f4ec944c7c31d44be44e1928d4f702791fd307f30bce42c1e4dfd1b6dd202dfc5091a3ca1c",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}