{
  "manageEntity": {
    "action": "Save",
    "entityId": "437294886",
    "entityType": "Track",
    "nonce": "0x225adf78cf739146edc8724f437d74fdc00bc9a02bfe3d44f46885e35b938ae6",
    "signature": "0x21a99c71d293ebf83d3b914699808813aa746de61cadc4edede63dfcb5b0bec928a10f6237213e742560e9338f78bc9bf6829acd1f7f4d602e3a6428e9401c821b",
    "signer": "0x73317E9D44b6E1b7d146760b12dc5546Cd140ED2",
    "userId": "683609933"
  }
}