{
  "manageEntity": {
    "action": "Save",
    "entityId": "349405066",
    "entityType": "Track",
    "nonce": "0x758f69f567e07985543ca2f01da029a506b55e7ea2b9a827ff0d420419622833",
    "signature": "0xf968543b31f439f8dd6275006aefd8de73a381020aabce645be3735317142f726af52bfc15d477aaf6da0ff9697b5cd6fbf7a8969c7a03ea2c11cc75a4cea10d1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}