{
  "manageEntity": {
    "action": "Save",
    "entityId": "405275102",
    "entityType": "Track",
    "nonce": "0xbbc391d07b0cc9ac23c2578f4748190b640775a072ac3fe8ffc1716dd939596e",
    "signature": "0xfd7df9eea766a47a101d9b4bac3be5f77dbb7b0aa88e1f2b3baa713a19187ee0251f993a65cd7c5a136ee50de9099571243f6648eaab4e0e7f5b02fc4f5345871b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}