{
  "manageEntity": {
    "action": "Save",
    "entityId": "474489",
    "entityType": "Track",
    "nonce": "0xa8c80add93a56e2fb6ecfaaa1609b31984227934c8907d4cec555aea120777c8",
    "signature": "0x4b1477034634f8d3743a12ee3eb8c8fc2e5c25b4f3354bb24e47aecc63d4d257521f61684b5f471beab0d870b20eb42d350592503858e8dbeb944d751fe05abe1b",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}