{
  "manageEntity": {
    "action": "Save",
    "entityId": "400418135",
    "entityType": "Track",
    "nonce": "0x2c7e4df1c9fbaa61c6043ce50c2e2bd5927e26c255150f9d555548478c64eb85",
    "signature": "0xd8e5e518d1cbd446137b936ae88bab3692f54b8636f9b82d82162210a89690f216185e681663d35b469dcc1d31cf5bf912fe398674391862bb2763611443daff1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}