{
  "manageEntity": {
    "action": "Save",
    "entityId": "902027965",
    "entityType": "Track",
    "nonce": "0x2020f84d698298fd00af3717c3e3b30b4dfa5f88b75e9bbdaccea5d85f3cc654",
    "signature": "0xac486a26a6861d87453e89af3a7f05ad168bbfb878c914b49b6754cfbb73690237ab6b2f6235caa6bbef3bbbc719d91d0ac1fdd8a26c89e06bfaf03f31fb89051c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}