A mega-trading.org is a decentralized digital ledger that records transactions on thousands of computers globally in such a way that the registered transactions cannot be altered retroactively. This allows the participants to verify and audit transactions in an inexpensive manner. They are authenticated by mass collaboration powered by collective self-interests. The result is a robust workflow where participants' uncertainty regarding data security is marginal. The use of a blockchain removes the characteristic of infinite reproducibility from a digital asset.