{
  "manageEntity": {
    "action": "Save",
    "entityId": "623760702",
    "entityType": "Track",
    "nonce": "0x87287dd3fcdbd9f92e15b02d6d4ba829d336604b45e1a890d2cf34a71a98a0f6",
    "signature": "0x651adc0dee2bf75086dc528c94d6830080ac6eccda36dcb4c52e0e3ea6a4852d2e65f78651aedb404e55ff6cd47ef1ad85c4de6780c348b76f2e4ea1206832b41b",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}