{
  "manageEntity": {
    "action": "Save",
    "entityId": "249272556",
    "entityType": "Track",
    "nonce": "0xbd8a2080ac24b4273f93bff2fb1cbf2161d3a7c9a423adcf5c489b314d9c4b1f",
    "signature": "0x51a89e64d8f21470ddf544161cb76efb38795ac4554526295e54d82cbea275e823031a2d3d993ccb8e9093de9c914fc140fa75d9a6fd7614e00e328b2bf423fc1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}