{
  "manageEntity": {
    "action": "Save",
    "entityId": "907186",
    "entityType": "Track",
    "nonce": "0x8941869a11111976b8b69b8c6369a1c32fe32b1d12864541c89aa76f36f6e120",
    "signature": "0xedf6a5a16e958a100d08929667cc98cda3ae995ce401710ff646dcecc30731ae45ac5bcbe52a82eac6e93ec2f5ec99071bd74fd46780b94db0fb0934a1232cba1c",
    "signer": "0xfa1f98f0530E55C2BEFA45f0F1B3A699b4559136",
    "userId": "149566028"
  }
}