On Thu, Sep 07, 2017 at 06:37:19PM +0200, Pavol Rusnak via bitcoin-dev wrote:
> On 07/09/17 18:30, Kabuto Samourai wrote:
> > Why not make this block height, rather than a timestamp?
> 
> Blockheight depends on the chain. XPUB is not tied to particular
> chain/coin.
> 
> Also there are already cryptocurrencies that do not use blockchain, but
> directed acyclic graph (DAG) for storing transactions. So it would not
> be obvious what number to use as a blockheight.
> 
> OTOH all blockchains contain timestamps in their blocks, so we can use that.

More to the point, even for the blockchains that don't contain timestamps in
their blocks, their blocks do exist in our spacetime continum and thus are
created at a specific point in time. :)

If someone does however come up with an example of a blockchain that does not
occupy our spacetime continum, I'd love to hear about it!

-- 
https://petertodd.org 'peter'[:-1]@petertodd.org