{
  "manageEntity": {
    "action": "Save",
    "entityId": "442854",
    "entityType": "Track",
    "nonce": "0xdb83e131801061ace971535a7750dfa744a8a51111bde342cd3fe18ea22802bd",
    "signature": "0xf9d76a6d7414ac2adc9209d6d0f69ed3cce8229d929a10470643aeb8ffe8ec41607e6d2b2739fac50837061cff5135a87bd1ad536ed22279062dfa6c30ae16af1c",
    "signer": "0x373882f7b1B72e7C5Ccb114CdDEce301381Df5ff",
    "userId": "324124853"
  }
}