{
  "manageEntity": {
    "action": "Save",
    "entityId": "1666718695",
    "entityType": "Track",
    "nonce": "0x1399aa370c316fb4c1f7a680afed8e7cde83536b0a62a9b84330768392ac6542",
    "signature": "0x82ac536840886d8c4e72952d42c623a03d4c08c850bd8e38f75d31f9b19eb14b1bbb4dddeca78e7c54ab6ec6ff0ceabb8ecda4ffb26e32ac2ff81e740749a2451c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}