{
  "manageEntity": {
    "action": "Save",
    "entityId": "1421320790",
    "entityType": "Track",
    "nonce": "0xac73ba84cd0e7e071630ba57f2e396b20eeac419e65a79c1cbe7b41083153b9c",
    "signature": "0x7c0ea9185f552b9128660750bbd19751c127fff8a6c026ce79beabef41c6032b3ba62d3d3a9f2d5a029567104af53053017ce67a475b214e79f430537a2ee85a1b",
    "signer": "0x34Cea527C1dc0575a5B686515aad0Bf8F3b5f97E",
    "userId": "13589021"
  }
}