On December 17, 2025, former Tsinghua University associate professor Hu Yilin discussed secure methods for storing Bitcoin private keys on the Sea Talk podcast. Hu revealed that he memorizes all 12 mnemonic words using "full brain" memory techniques. Acknowledging the challenges many face with this method, he recommended a "half-paper, half-brain" strategy, where three words are memorized and nine are written down. This approach ensures that even if the paper record is stolen, the thief cannot immediately access the funds, allowing time to transfer assets. Hu also suggested that full brain memorization is not difficult, advocating the use of native language mnemonics, such as Chinese, and creative aids like poetry or drawings to master the words in three days.