@JsonIgnore
    @Override
    public List<Authentication> getChainedAuthentications() {
        val list = new ArrayList<Authentication>(2);
        list.add(getAuthentication());
        if (getTicketGrantingTicket() == null) {
            return list;
        }
        list.addAll(getTicketGrantingTicket().getChainedAuthentications());
        return list;
    }
The ticket ids which are tied to this ticket.
core/cas-server-core-tickets-api/src/main/java/org/apereo/cas/ticket/TicketGrantingTicketImpl.java