{
  "manageEntity": {
    "action": "Save",
    "entityId": "900506295",
    "entityType": "Track",
    "nonce": "0x243b3f156cb38ccde2a7c581464d109a9b2575b1098e9ea20a64d88f4cc8bcb5",
    "signature": "0xa5d4c00a2d4bbfd1e84f66fec11ff26618ca60392950e627a179a6243dd045a0148ded2e134841504187b7e1751d3a95c3f89fb81fb007f52ef76c200d2f83571b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}