{
  "manageEntity": {
    "action": "Save",
    "entityId": "617778346",
    "entityType": "Track",
    "nonce": "0x2602553666b550456a0f98c127b47bece7a3819cd9e94fa0eafc9069bc7e56d0",
    "signature": "0xb63b68b10bca62ca1cc22a0bf7ba68807a522916d290a793e7b1db136ba1226957a7db0462cb73af696b533197169b251b73de10f020d3cd1837736008fe092f1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}