{
  "manageEntity": {
    "action": "Save",
    "entityId": "2129925326",
    "entityType": "Track",
    "nonce": "0x85367f53bfa35e24eb4a0cc6bceb886b83a40a178ebb9add08134e715a2de8f4",
    "signature": "0x85f62eb191e4eaea8dfcaa43ab257bba12a56e35c9970efefe94dcbe71811b497c3935966ac9fed63345106cd2924ce4a5121919c8b5240e6c8a8410e69590601c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}