Great article. The only problem I had with it was an IP address being analogous to a bitcoin public address. Stripe.com is vouchsafed by a certificate authority, so when you go to the address either by typing or by a link, you have some reasonable, if sometimes tenuous, assurance that you are dealing with the real stripe.com and not some typo-squatting fraud or MITM. Using friendly addresses for payment removes the statistical uniqueness of public keys from the equation. As long as the friendly identifier is not the primary one, there is no issue, but I see nothing wrong with establishing identity through copy/pasting a bitcoin address from a known trusted source or scanning a QR code.