{
  "manageEntity": {
    "action": "Save",
    "entityId": "428103498",
    "entityType": "Track",
    "nonce": "0x87bb27cff3c9a8aba3aa7cb23e3baf66c7ba7a6583911d327c950cd6a4691dfb",
    "signature": "0x996416afef55b63f486a04bbb8772b3e0e3b3dd5c21b8e60b25a10242e0de2e905097599504d1300e5ba3040deb3c8f9a1199a6ce5e51fff283fb578b60fc3b11b",
    "signer": "0x5d8091c5439F52184dFD827f33FF815dCc827bA8",
    "userId": "52403052"
  }
}