{
  "manageEntity": {
    "action": "Save",
    "entityId": "1600647510",
    "entityType": "Track",
    "nonce": "0xb6cd9ed68f819cbc76d35b6ce5b6777e5192b4b8ff09f0979b32376e02964528",
    "signature": "0x9ccea42682e159709b380169295ed072de344b2022ce3ff2cc510c24724098e22cd486e3ce0b84e4377a745bb1c3d905421ad3344a57f959bc51ad5fd74575431b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}