{
  "manageEntity": {
    "action": "Save",
    "entityId": "138148",
    "entityType": "Track",
    "nonce": "0x3826f58cae0cd000ee5e72d78c2ef613cc4ed0429c02d4a3b48452e7382ed28e",
    "signature": "0x91007e86387d87a45566356ef8350eee57d03276cc535be97c06a8aa023e4a81704f8e2673c0685e117afbd6fcf73e80f3d9a7a73b161b7dab4a57cffc1f1e511c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}