{
  "manageEntity": {
    "action": "Save",
    "entityId": "650358338",
    "entityType": "Track",
    "nonce": "0xfcd02c387a1668ec27a2d1734139a0fc6e091fca203a8cedd6f1ff392aacf246",
    "signature": "0xe6dc2130d8a55a83dc16069865f12806208a812c2d9f4e37cd22065fbe3fc8a0619c3c9d45118f8eb2f2c0f6c68d2d6353a871c5319c3942013c716a6242d87e1b",
    "signer": "0x0C6D8C2BA2A5C59e3a0Af2b5Dd3995aA0D91221D",
    "userId": "755516"
  }
}