http://vkp7367tcjpqdwwckigrdrvmwvispvbpg5rlsr2chjxvppfg7hipagyd.onion/Philosophy/2005-Bit-gold
The last-created string of bit gold provides the challenge bits for the next-created string. To verify that Alice is the owner of a particular string of bit gold, Bob checks the unforgeable chain of title in the bit gold title registry. To assay the value of a string of bit gold, Bob checks and verifies the challenge bits, the proof of work string, and the timestamp.