{
  "manageEntity": {
    "action": "Save",
    "entityId": "815701929",
    "entityType": "Track",
    "nonce": "0x8b1c5eca791d2293f3b1fba05cfb9354ee454c63f611cceb2e29e05a9e971c51",
    "signature": "0xdaabbf685ba70ce02e008f9437df919fc59926eb970b48c0597ccf43abafe141305f713508ce5977f76d64ab3ebf8313b1484c8d2c4dd0096f54a37989c9f0721c",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}