{
  "manageEntity": {
    "action": "Save",
    "entityId": "1128710",
    "entityType": "Track",
    "nonce": "0xc77a641b54d097dc12e98f8adb5117adcd1103e300a999525b1b63bea84a3643",
    "signature": "0xbf46b0c8e59186632af2d07d17827b03275952e8965b0db54906678d38199acd644636d0d9aef2f90dbc01062475e24f6ab6e7b96959e827e7d4fc3bcbdfe98d1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}