{
  "manageEntity": {
    "action": "Save",
    "entityId": "997909",
    "entityType": "Track",
    "nonce": "0x76d2452e1aafd2564272d72788c17456f2db83c5b8d8c0274562c5dac9cb8979",
    "signature": "0x86ed28b00925f61c7ae122072026e2f60aa67a320e3d0004bc11f3dc4f37256900df12621b6bf76cf70df9f533dc4c05944bfeeae6e7de314bf22af47d60c9ec1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}