{
  "manageEntity": {
    "action": "Save",
    "entityId": "21730",
    "entityType": "Track",
    "nonce": "0x3fc174e406f3c0cda7a901bf1b8834c52a74f9f6d25b1d2942a751eb444c592f",
    "signature": "0x9e4b0effbbddc0b9baeff0fa11aba295ab69e793244e7ca7f36ed6c5ced9f7df37887c0724eb8bd73b71b8bd515ef7d3b62b2cc3b073456588e3995db1e95e141c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}