{
  "manageEntity": {
    "action": "Save",
    "entityId": "1638251318",
    "entityType": "Track",
    "nonce": "0x858ea5baeb46b1dc114574b1433492f5bfc06ed110cb26043f7e17c9cd5d1ccd",
    "signature": "0x3d82262e5acab7c414d294f729ee3da08f797c374db45a70112577ad74e4610b6419993f8db10e66b57da657e5e135d01496c9bf3f85df9ee798580965d8bac41b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}