Reference for Gittin 71:9

ובסימנא לא והא רב צייר כורא ורבי חנינא צייר חרותא רב חסדא סמך ורב הושעיא עין רבה בר רב הונא צייר מכותא שאני רבנן דבקיאין סימנייהו

the Get was valid, but if not, it was invalid. Said Rabban Gamaliel: A most important regulation was laid down [by the Rabbis], that the witnesses should write their names in full in a Get, to prevent abuses.<span class="x" onmousemove="('comment',' Because now it would be possible to find witnesses who recognised their signatures. ');">⁸</span>

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