Bitcoin’s Random-Letter Inscriptions Point to Automated Mainnet Testing

About 40 random-letter inscriptions have appeared on Bitcoin (BTC) each day for three weeks, a pattern consistent with testing a data-publishing tool on the mainnet. The sample contained 562 strings. Each of the 26 English letters represented between 3.6% and 4.2% of the characters, a pattern that differs from ordinary English text. Transactions in the activity typically use a single input, generate a fresh change address and include an OP_RETURN data output. Later transactions often spend the previous transaction’s change, creating chains of as many as 86 transactions.