{
  "manageEntity": {
    "action": "Save",
    "entityId": "1637454203",
    "entityType": "Track",
    "nonce": "0xc4b4adcc043b53368c936b1a6e8c5ec648296c66b7b877207da46dc8f47fe71a",
    "signature": "0x84fc87cbd7b12dc3750482778161efed645f968e25cec44f72080e47621dbf280f1f5951959fc8d2acceedfbb5671db46b5f1320c214e0d6d46c3cf89b044e901b",
    "signer": "0x48997477d821e30d3Fa835d1Ee7809B3253Cb100",
    "userId": "75085"
  }
}