{
  "manageEntity": {
    "action": "Save",
    "entityId": "480254",
    "entityType": "Track",
    "nonce": "0x3eb2d45951d4016231f3e108b512fd02cfa8490a92866b946ac4b9caaebe6a40",
    "signature": "0x7770a1ac0627a2b233ae5c73a2145e784621bfa62843bd35b780cf7fbee133087c2e8a33fe96041a0e26b2743f97cfe0f86d27b904e612afe8ee5eadb1af2dad1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}