Josibake joins us to talk about his work on the Bitcoin Core wallet, bitcoin data and onboarding to bitcoin development. We discussed: - Analyzing historical transaction data (1:25)   - Creating a publicly available dataset (4:12)   - What could it be used for? (7:30) - Bitcoin Core wallet (9:00)   - Why have a wallet in Bitcoin Core? (10:00)   - Separation of GUI from wallet (12:35)   - Only use one input type when building transaction (13:40)     - PR #24584 in Bitcoin Core   - How is working on the wallet? (17:15) - Cross-input signature aggregation (19:48)   - Catching up on history (20:40)   - Writing the BIP with Hackspec (22:05)   - Thoughts on shipping cross-input signature aggregation separately (22:50) - Onboarding to Bitcoin development (28:35)   - Running the seminar with friends (29:55)   - Giving back to open source (31:20)