{
  "manageEntity": {
    "action": "Save",
    "entityId": "1618518478",
    "entityType": "Track",
    "nonce": "0xf7ed731060a2d8a0188f674c458555306c8f7a0b85d498a7847a87bb0be8da1c",
    "signature": "0xa820ffad23a5aaf91dd8413e0325ffe85d3ac1bf9222c34a4cfdee26fa86aa87395b78c98d3257e13dc7f31828f723de39121b43c0db987e34edd7c0f7619ee11c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}