{
  "manageEntity": {
    "action": "Save",
    "entityId": "395407",
    "entityType": "Track",
    "nonce": "0x1aa4b2faf3eda6f633d189a0b4f6f4b27caf9bf48bca166d5a56735b010a4772",
    "signature": "0xff8ba5f63c990ba239562c7c54dfdfcaa319ef2ade28f70a9efe61a0e53d680f3b2e5c811e7887a1009e12e8569f6fa938eb8921dd84f948185354e39dd885961c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}