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The app for independent voices
I had a feeling you needed this peaceful beauty in your life today. I know I did…
Last Feb I casually posted this neck stretch on Instagram (that I thought everyone knew 🤷♀️) and it blew up in a way I couldn’t imagine. It’s now been viewed over 8 million times 🫣😬🤣 and has brought so many wonderful people into my world.
So give it a go, it’s a pretty lovely stretch. (Though it’s not actually magic, it’s just an up…
The Loneliness No One Talks About
No one warns you about the loneliness that comes with growing.
The silence when old friendships stop fitting, but new ones haven’t formed.
The ache of outgrowing places, conversations, even versions of yourself.
Growth is beautiful, but it can also be isolating.
Keep growing anyway. You’ll find your kindred spirits.
You made it, you own it
You always own your intellectual property, mailing list, and subscriber payments. With full editorial control and no gatekeepers, you can do the work you most believe in.
A PERSONAL SHARE
I have one subscriber who reads a single chapter of my book every week, than emails me every Sunday morning with his feedback.
He's 75, and has no idea how to use the Substack app. He will never see this note.
It makes my entire week when I get his email. He is a wonderful soul, funny and lovely, and he keeps me moving forward.
How do I even repay that?
Great discussions
Join the most interesting and insightful discussions.
this and never watching an instagram reel again
I spent hours studying how Apple Pay works, so you don't have to.
Here's what I learned distilled into 9 sentences:
They don't store credit card details on iPhone or Apple servers, instead send it to the payment network
The payment network creates a unique number, DAN, to represent the credit card and iPhone
The iPhone stores DAN in the secure element, a specialized chip, for security
The card reader creates a transaction record when the iPhone communicates with it via NFC
The iPhone creates a cryptogram, single-use password, using DAN and transaction details
The iPhone sends only cryptogram and transaction details to the payment network
The payment network validates it by regenerating the cryptogram using its DAN copy
The payment network creates a new cryptogram using DAN, response code, cryptogram
The iPhone validates it by regenerating the new cryptogram and sends it to the card reader
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👋 PS - I wrote an article with visuals about this case study in my newsletter:
