{
  "manageEntity": {
    "action": "Save",
    "entityId": "559451475",
    "entityType": "Track",
    "nonce": "0xa3d5eab05e8971215df4c5763ef592a5ac8fd9ec98e3ad45f01b98ba15837fa1",
    "signature": "0x25ed2c982e086c6ec696a686b2afe07eb9d81977698f50cf96ce5f0606bb7bef778f7222cd3e142db6b4697838b44c6f0793558e0838fb21aa363cae040071381b",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}