{
  "manageEntity": {
    "action": "Save",
    "entityId": "947537220",
    "entityType": "Track",
    "nonce": "0x4a28af87d9c8f72c799c03a80a01e7240e9929f76dcd64060a5e13641d6d0615",
    "signature": "0x765b3d36b757e83be4ec04d3adbcda64c306a1181767c1b7cb9849e9124c86d07c979af18ff3bd486b281f14008ea9a0472561f894cafcb7c972862de5695e811c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}