| > I have to question the design of Urbit why you chose to go with 2^32 addressing space? They haven't. They went with base 256, for easier recognition of 32-bit (and 16-bit, and 8-bit) numbers. You can get a 2^128 identity or a 2^32 identity (or others.) The fact that 64-bit numbers (like ~novfes-lodzod-sibfes-talzod) in Urbit's base 256 are twice as long as 32-bit numbers (~sibfes-talzod) which are twice as long as 16-bit numbers (~dalryp) and down to 8-bit numbers, which are the most memorable and highly coveted (disclosure: you're looking at a comment written by ~del, aka Hex number 0x25) is something between a feature of Urbit's networking stack, and an unavoidable consequence of doing math and dividing things up between persons that are remote from each other, therefore each needing addresses to be identifiable. Identities that are made of 128-bit numbers are free, and essentially unlimited. They are basically public key hashes and the risk of a collision is sufficiently low that there is no need for them to be generated by a single authority and centrally assigned. (Note that this does not necessarily scale to the population of the earth and beyond as a solution to addressing graph nodes and efficiently routing traffic between them.) Identities that are made of shorter numbers are limited in number and assigned hierarchically; even if there are a boat-load of 64-bit numbers, it's not half as many, it's ½^64 times as many. Certainly there are more 64-bit numbers than humans on Earth today, or for the foreseeable future. Whether you consider this to be more problem or solution will probably depend a lot on which side of the spam-wars you find yourself on. Currently there is no Urbit software or infrastructure that I am aware of that algorithmically discriminates against one kind of numbers or another. You won't expect one authority to differentiate each of 8-billion humans and make sure that each one is granted a separate identity (but not more than one), will you? How about 256 such leaders? Still seems far-fetched, doesn't it... especially given the difficulty of coordinating 256 separate leaders. 65536 very smart individuals probably also cannot be expected to coordinate the identities of the rest of the humans in the world. It would be gargantuan undertaking just handling it when some of these leader-folks have forgotten or lost their passwords (and potentially disastrous for the 0.0015% of the world's population under their charge.) 64 bits of hierarchical ID space is enough for every 32-bit identity (planet) to individually dole out as many 64-bit numbers (moons) as there were 32-bit numbers to begin with. Urbit takes advantage of this roughly to make scaling the network's identity framework to rather immense proportions, happen at least a bit more naturally. If your 32-bit leader gives a lot of 64-bit IDs to people that turn out to be spammers, you run the risk of being lumped in with those spammers by algorithmic processes. Imagine such a process that tries to discriminate against spammers and keep them from spamming everyone who is known on the whole network, at any scale. It's not a simple proposition, at all! |