{
  "manageEntity": {
    "action": "Save",
    "entityId": "498504192",
    "entityType": "Track",
    "nonce": "0x1a412369d400fe77d63418e108022813261977f8cc467178642f092d30003829",
    "signature": "0xd264bfd5185d93a68decb23010ba1091b555f6290b53f8455630c164dd5b93ab554b4d5a744e64301165a0875fffa501c4dda364749ce8bfcafd00f1534e61fe1c",
    "signer": "0x849b8180f084363b37768C823c174C9786020A66",
    "userId": "817339612"
  }
}