A case for permanent receipts

A few years ago, faking a receipt took a designer, a printer, and some nerve. Today it takes a prompt. AI tools generate a convincing PDF in five seconds. Photoshop the order ID; tweak the date; match the merchant's font. The result is good enough to fool anyone who isn't already suspicious. Most people aren't.

This is a small problem until you try to resell something.

Trust is the bottleneck on price

Walk through eBay, StockX, GOAT, Vestiaire Collective, Poshmark, or any of the marketplaces that turn used goods into liquid assets. The most common question on every listing, asked or unasked, is some version of: can I trust this is real, and that the seller actually owns it?

If the buyer can answer yes, they pay full price. If they can't, they pay a discount or they walk. Trust is the bottleneck on price.

Receipts are how we used to answer that question. I bought it from this store, on this date, for this amount. The original receipt was the closest thing the secondary market had to a chain of title, a record that started with a real transaction at a real merchant. When AI made receipts trivial to forge, it broke the cheapest source of trust the resale market had.

The damage of this is not distributed evenly, and that part matters. An accredited dealer relisting a watch can charge a premium because the dealer's name is itself a trust signal. The buyer trusts the storefront, the brand, the chain of provenance behind the listing. A regular person selling the exact same watch on eBay or in a private message thread does not get to charge that premium, even when the watch is identical and the receipt is real. The premium goes to the dealer; the gap closes around the seller. That gap is widening as fake receipts get easier and the trust signals real merchants offer become more valuable. The resale market has a fairness problem, and the fairness problem is getting worse.

So we have a problem with growing leverage on it. Resale is a 300B+ category and rising. Forgery just got 10x easier. The trust mechanism we relied on for a hundred years no longer survives a five-second AI prompt.

What we're building

A permanent receipt is a record of purchase that lives outside the merchant's database, in the buyer's hands, forever. It is issued by the merchant at the moment of purchase. It is verifiable by anyone. And it travels with the item; if the buyer resells, the receipt can move with the item to the next owner, or remain as proof of original purchase, depending on what the parties agree to.

The shape of it: when you buy something on a Shopify store that has installed AfterMKT, you get a receipt. Not just an email. A receipt that has three properties together that an email can't have:

• Permanent. It cannot be edited or deleted. Not by us, not by the merchant, not by anyone.
• Tamper-resistant. A forgery is not a forgery if it's indistinguishable from the original. Our receipts are digitally signed in a way that makes a forgery detectable to anyone who checks.
• Portable. It is not locked to a marketplace, an inbox, a wallet, or a country. It is yours. You can read it anywhere. You can prove it anywhere.

The merchant signs it. We carry it for the buyer. The buyer keeps it.

Why Shopify, first

Shopify hosts most of the merchants we want to work with. Independent sellers, brand-led shops, and serious operators who care about how their products travel after the sale. It also has the deepest integration surface of any major commerce platform: well-documented APIs, mature webhook delivery, a clean extension model on the buyer-facing side.

That combination, serious merchants plus serious tooling, is why we started here. The product itself is platform-agnostic. The integration shape isn't, so we picked the platform with the most receipts to issue and the cleanest path to issue them.

Other major ecommerce platforms come next, in the order that makes sense based on what merchants want first. Same product, different integration plumbing. The thesis doesn't change with the platform.

The benefits, concretely

The most direct benefit is in the after-market.

If you bought something a year ago and want to resell it, a verifiable receipt is worth real money. Not abstractly, not someday: today. Marketplaces increasingly surface authentication and provenance signals in the listing. A buyer who can prove their item was originally purchased from a real merchant gets a price premium. A buyer who can't, doesn't.

How much premium depends on the category. For watches, sneakers, handbags, and electronics where authenticity is the deciding factor, the spread between authenticated and unauthenticated resale runs from roughly ten to forty percent depending on the platform. For categories where authenticity matters less, the premium is smaller, but it's there. Real money that regular sellers currently leave on the table.

This is, fundamentally, a fairness mechanism. The premium that big-name dealers and authentication services have always commanded becomes accessible to the regular seller, because the receipt is portable from the original sale to any subsequent listing. A receipt issued to you when you bought the watch travels with you when you sell the watch. The dealer's premium stops being a wall between you and full market value.

The second benefit is for buyers who never resell. Receipts you keep are receipts that survive the merchant. If the store that sold you something closes its doors next year, your receipt does not vanish with it. The proof of what you bought is yours.

The third benefit is for merchants. Today, the brand equity of a sale ends at the moment the package arrives. After that, the merchant is invisible: the item changes hands on eBay or to a friend, and the merchant has no way to participate in any of that. A permanent receipt keeps the merchant's name attached to the product through every subsequent transaction. The brand stays attributed.

Why this should be the default

Receipts are the most universal commerce primitive there is. Every purchase, in every category, in every country, generates one. They are the closest thing the world has to a shared transaction format.

But today's receipts are local. They live in a Shopify dashboard, an email inbox, a paper file, a chip-card statement. They don't travel. They don't survive past the platform that issued them. And they're easy to fake.

We think the default should be permanence. Every purchase should produce a record that the buyer keeps, that travels with the item, that can be verified anywhere, and that doesn't depend on any single company staying in business. Issued by the merchant, owned by the buyer, verifiable by anyone, never anyone's investment vehicle.

This is not a new opinion. The infrastructure to do it has only recently gotten cheap enough to be reasonable.

The principles we hold

We're trying to build infrastructure that is going to outlast any single company, including ours. That requires a few principles we don't move on.

The buyer comes first. The receipt is theirs from the moment of purchase. We never custody it. We never charge them to access it. We never ask them to install anything they don't want.

No buyer personal data anywhere we control. What gets recorded is product information. What was bought, from whom, for how much, when. What does not get recorded is the buyer's name, email, phone, or shipping address. That data lives at the merchant, where the buyer chose to share it; it never leaves Shopify and reaches us.

Receipts are receipts, not investments. We don't mint speculation. There is no AfterMKT token. Every receipt represents one real purchase, and its purpose is to prove that purchase. We are uninterested in the kind of crypto product that is one-third proof-of-purchase and two-thirds slot machine.

Universal verifiability with no lock-in. Anyone, anywhere, with any wallet, can read a receipt. We are not the gatekeeper. We are not the source of truth. We are a publisher of records to a shared infrastructure that no single company controls.

Honest about what we are and aren't. We are a receipts product. We are not a marketplace, a custody business, a token, a yield platform, or a financial instrument. When we ship something, we tell the truth about what it does and where it falls short.

How it actually works

You buy something on a Shopify store that's installed AfterMKT.

The merchant's order data flows from Shopify to us through a webhook the moment the purchase is paid. We record the order: product, price, quantity, merchant, timestamp. We never see your name, email, or address; we drop those at the gate before we write anything down.

We send you a "claim your receipt" link, surfaced on the Shopify thank-you page and in the order confirmation email. You click it. You connect a wallet. The receipt is issued to your wallet.

That's it. The whole thing takes thirty seconds.

A note on the underlying technology

Permanent receipts need three properties at the same time: permanence, tamper-resistance, and portability. There isn't a database that does all three. A traditional database has a backup, a delete button, and a CEO who can be subpoenaed. Each of those is fine in normal contexts and disqualifying when the product is "your record will outlast any single company."

We use Solana, a public, shared ledger, because it gives us all three properties together. Ledger in this context just means a record-keeping system that many parties can read and no single party can edit alone. The receipts we issue live on that ledger as compressed records, which keeps the cost of writing each receipt to fractions of a cent.

This is, we think, the use of crypto infrastructure that the technology was actually designed for. Not speculation. Not yield farming. Not pumps. Just a shared record-keeping system that anyone can read and that doesn't go away when a company does. The same way the internet's underlying protocols outlast any single internet company, public ledger infrastructure can outlast any single ledger company, including, eventually, us.

If "Solana" or "ledger" or "compressed records" is unfamiliar, that's fine; it doesn't change anything about how the receipt works for you. You see a button. You click it. The receipt arrives. The technical layer is doing work in the background to make sure that receipt is yours forever, in the same way TCP/IP does work in the background to make sure your email arrives.

Making it invisible (Privy)

Today, claiming a receipt requires connecting a wallet. For someone who already has Phantom or another Solana wallet, this is one click. For someone who doesn't, it is a small mountain. Install an extension, write down a recovery phrase, fund it with a tiny amount of network currency to begin doing anything. We are not naive about this. The friction is real, and it's the largest reason permanent receipts are not already standard.

We're integrating Privy to remove that friction. Privy lets a buyer claim a receipt with their email address. No wallet to install, no recovery phrase to memorize, no education required. Behind the scenes, Privy custodies a wallet for the buyer; the buyer never has to think about it. The receipt arrives the same way a confirmation email arrives.

For technical buyers who prefer self-custody, Phantom and other Solana wallets continue to work exactly as they do today. The choice is the buyer's.

The goal is for AfterMKT to work for someone who has never heard of Solana, never opened a wallet, and never wants to. That person should be able to buy something on a Shopify store, click a link, and walk away with a permanent receipt without ever encountering anything they'd recognize as crypto.

This is what we mean when we say the underlying technology should be invisible. It should be doing work that the buyer benefits from but doesn't need to understand, the way the bank's wire-transfer rails do work for an Apple Pay tap.

What we're going to do, and what we're not

We are going to ship the platform integrations that put us where the receipts are. Shopify is live. We're expanding to other major ecommerce platforms as quickly as we can do it well. We are going to ship Privy email-based claiming so that a non-technical buyer never has to see a wallet. We are going to publish, openly, what the receipt format is, so any wallet, any marketplace, any auction site can read and verify it without integrating with us first.

We are not going to ship a token. We are not going to run a marketplace. We are not going to sell speculative products on top of receipts. We are not going to charge buyers for keeping records that should belong to them.

We are also not going to oversell. The receipt does not prove the item is authentic, only that a real purchase happened at the merchant. Authentication of the underlying item is a separate problem, often a harder one, and one that we plan to support but not solve alone. Permanent receipts are an input to authentication, not a replacement for it. We say this clearly because the wrong way to introduce a trust primitive is to overpromise and erode the trust you were trying to build.

The longer arc

In five years we think permanent receipts will be the default. Every meaningful purchase will produce a record that the buyer keeps, that the merchant signed, that the secondary market can verify, and that survives the company that issued it.

In ten years we think the people building it won't think of themselves as crypto companies. The same way the people who route your phone call don't think of themselves as a packet-switching company.

This is the part of crypto that was always going to matter. A shared infrastructure layer that nobody owns and everybody can use. Receipts are one of the first useful things to build on top of it. They are not the last.

We're building this slowly and openly because that's how you build something that has to last. Thanks for reading.