{
  "manageEntity": {
    "action": "Save",
    "entityId": "1128764890",
    "entityType": "Track",
    "nonce": "0x4783ed9a9aa7fe46bb951a6128859edbe89c6528c893ee742f2177cefce4c48e",
    "signature": "0xfdc7fa4b6f15f4ce981a9549cf11461c2c4542dd9e024b204a87ae27d8a8add55cca5b1c18d6672e697e7c870f84ab5106d76367a82485c28cc1c81023f1fdf21c",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}