Investigate shortening the block identifiers #3
Description
With 800 enrolled issuers we're using 800 * 0.032kB = 25.6kB just for block identifiers. The block identifiers are SHA256(issuer spki), and we only consider issuers that chain up to the mozilla root store, i.e. they're not adversarially chosen. So there would be no harm in truncating to 20 bytes or even 16 bytes per identifier.