https://maciejlewandowski.dev/ Field notes from custody and wallet infrastructure: Bitcoin, EVM, Solana, and the backend systems that hold real money. en https://maciejlewandowski.dev/blog/deposit-detection.html https://maciejlewandowski.dev/blog/deposit-detection.html Wed, 22 Jul 2026 12:00:00 GMT The deposit paths that silently lose money on EVM, Bitcoin and Solana, and why continuous reconciliation is the only real fix. https://maciejlewandowski.dev/blog/transaction-state-machines.html https://maciejlewandowski.dev/blog/transaction-state-machines.html Wed, 22 Jul 2026 13:00:00 GMT Broadcast is not done, confirmed is not final, and retries are where money gets lost. https://maciejlewandowski.dev/blog/utxo-coin-selection.html https://maciejlewandowski.dev/blog/utxo-coin-selection.html Wed, 22 Jul 2026 13:30:00 GMT Your Bitcoin balance is not a number, it is a set. Fees, dust, privacy and the concurrency problem the tutorials skip. https://maciejlewandowski.dev/blog/stuck-transactions.html https://maciejlewandowski.dev/blog/stuck-transactions.html Wed, 22 Jul 2026 14:00:00 GMT A remediation playbook for transactions that will not confirm, across Bitcoin, Ethereum and Solana.