transaction-replacement

BitcoinJ open-source release and protocol questions

Mike Hearn announces the open-source release of BitcoinJ under the Apache 2 license, and asks about merkle branch verification, scripting language ideas, and why transaction replacement was disabled.

Using Bitcoin as collateral for abuse prevention

Mike Hearn offers to write a wiki page on Bitcoin contracts, asks about re-enabling transaction replacement, and asks whether Satoshi plans to rejoin the community. He raises the tragedy of the commons concern about mining fees.