{"type": "object", "properties": {"EFFECTIVEDATE": {"type": "string", "examples": ["2026/01/20 00:05:00"], "format": "date-time", "description": "Market day starting at 4:00 am\nWARNING: Despite what the name suggests, this is a datetime, not a date."}, "PARTICIPANTID": {"type": "string", "description": "Participant ID"}, "VERSIONNO": {"type": "integer", "minimum": 0, "maximum": 65535, "description": "Version of the offer for that date"}, "FILENAME": {"type": "string", "description": "Submitted file name."}, "LASTCHANGED": {"type": "string", "examples": ["2026/01/20 00:05:00"], "format": "date-time", "description": "Last changed date and time."}}, "required": ["EFFECTIVEDATE", "PARTICIPANTID", "VERSIONNO"], "description": "OFFERASTRK tracks successfully acknowledged ancillary service reoffers.\nOFFERASTRK data is confidential to the relevant participant.\n\nSource\n\nOFFERASTRK is updated as offers are successfully acknowledged."}