{
  "manageEntity": {
    "action": "Save",
    "entityId": "19768782",
    "entityType": "Track",
    "nonce": "0x0074dbdf44b7f8ecbb2790c03ebc5db8b431f46d96622a4c508ba3d8172b0f27",
    "signature": "0x457c19ecb90db1c74bf368666281901050f634f5f016120993b7c805d36314c16ed69895f8867ec013291874a20d5f39f994baf20133c773a50bccb71f6429581c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}