{
  "manageEntity": {
    "action": "Save",
    "entityId": "658975444",
    "entityType": "Track",
    "nonce": "0x88df7a4cf1351b424f31f606697f0d76027c364429a7335943b51d9197a9adda",
    "signature": "0x7b6dbf42b4ffeabf75a837bf2c8a0f52d7f6ff8b7c626d05018debda3b5ca9e1367daf81b6e0293513e3dfd92b1bb45f0a5625c16f6385cd328107cff46f1c9a1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}