{
  "manageEntity": {
    "action": "Save",
    "entityId": "1890879150",
    "entityType": "Track",
    "nonce": "0x822c70179113c28c9c723524cfd55bc941b6e992018dcb563b461d3c23d35aaf",
    "signature": "0x73f0afe522ab2250f76fef9975711ecd6d3bd1fed871b962e86599779701623a6caaa94b82c70a53866fcec070861b3b9595a2cc1d335e8c6b755ff664bf74bf1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}