{
  "manageEntity": {
    "action": "Save",
    "entityId": "302409055",
    "entityType": "Track",
    "nonce": "0xcaa9ab493044ba0bdee4a150348bfdf31e96c8a790eeba8e90e953071c1b3dc4",
    "signature": "0x9c67b2fc3ea669f9233d657d4e423817449532b0d58b5a0a28e77fdff144038e559977c3e8a53a1b4fd8a42cc1311e1f151072ae0d91cf2d84501d9de4fd221e1c",
    "signer": "0x1A748d74Db6424f9EA1Ce41A3A445631765103bc",
    "userId": "799948905"
  }
}