gistfile1.py

blocks = list of all the blocks in the current chain
fork_number = the block height we'll fork to new adjustment algorithm at

coins_distributed = 0
for block in blocks:
    # This block template doesn't have subsidy information, IE, we don't know
    # how much was paid out in the coinbase
    if block.height < fork_number:
        # using the regular subsidy adjustment schedule and determine what the coinbase would have been at this height
        coins_distributed += subsidy for this block
    else:
        # Look at the difficulty of the last 30 blocks. Determine what portion
        # of the maximum subsidy would've been used for this block. Also, since
        # we know how many coins have been distributed we can determine the
        # maximum subsidy
        coins_distributed += subsidy for this block