Why did Zhou officials cast inscriptions onto bronze vessels?

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Chinese bronzes Bronze gu from Anyang, Henan province, China, Shang dynasty (c. 1600–1046 bce); in the William Rockhill Nelson Gallery and Mary Atkins Museum of Fine Arts, Kansas City, Mo.

During the Zhou dynasty, officials cast inscriptions onto bronze vessels primarily to serve as vehicles for recording significant events and reporting them to ancestral spirits.1

These inscriptions functioned as a means of documenting historical information, such as records of royal largesse or specific achievements. For example, one official used a bronze vessel to record the date of a successful military assault against the Shang and to commemorate the reward money received for that service. By casting these details into the metal, the events were preserved and communicated within the context of ritual ancestor worship.12