Add a product
Name, SKU, starting quantity and a low-stock level. The opening count becomes the first line of its history.
addProduct("Oat Milk 1L", "OAT-1L", 30, 12)
■ a tiny inventory log · built on BOT Chain
Inventory you can trust.
Every restock, sale or correction is stamped on BOT Chain, so your stock history can't be quietly edited.
■ the problem
A stock count in a spreadsheet is only as honest as the last person who edited it.
Three moves. One ledger.
No sign-up, no backend, no database. Your wallet is your stockroom, and BOT Chain keeps the receipts.
Stamp every change
Tap + or −, pick a reason, confirm in MetaMask. The quantity updates and the change is logged with its block time.
+12 RESTOCK · qty 30 → 42 · tx ↗
Share the proof
Send your public link. Anyone can open a read-only view of your stockroom and its history — no wallet needed.
?shop=0xABC…
Watch one change get stamped.
Twelve seconds, start to finish: tap +, set the amount, confirm, and the history has a new line.
0:00 / 0:12
■ try it here
Tap a button. Watch the log grow.
This is the whole idea in one box. Each tap adds a line and nothing ever leaves. In the real app the same tap is a BOT Chain transaction you confirm in MetaMask.
- Reason on every line. Restock, Sale, Damaged or Correction.
- Before and after. Each line shows the quantity it started from and where it ended.
Oat Milk 1LOAT-1L · demo only, nothing is sent
30
ready ░░░░░
Small tool. Sharp edges.
Everything a shelf needs and nothing it doesn't. Four things it does well.
See what's running out
Set an alert level per product. When the quantity reaches it, the row turns magenta and the dashboard counts it.
One link, read-only
Your wallet address is your shop's address. Send the link to a partner, a supplier or a judge. They see the stock and its history, and can't change a thing.
Every change says why
Four reasons cover a small shop's week. Each one is stored with the change, so the history reads like a story.
Restocknew units arrived
Saleunits went out the door
Damagedbroken, expired or lost
Correctionthe count was wrong, in either direction
Two files run the shop
One page and one contract. No server to keep alive, no database to back up, no account to forget the password for.
Made for small shelves.
If you can count it and you'd like the count to be believed, it fits.
■ under the hood
Short enough to read over coffee.
The contract is about eighty lines. It keeps a list of products per wallet and a list of changes per product, and it only ever adds to them.
2functions that write
4reasons for a change
0admin keys or owners
0tokens, fees or payments
struct Change { int32 delta; // +12 or −3 uint32 qtyAfter; // 42 uint8 reason; // 0 Restock … 3 Correction uint64 at; // block time } function adjustStock(id, delta, reason) { // your own product only if (qty + delta < 0) revert BelowZero(); history[msg.sender][id].push(…); // there is no pop, no edit, no delete }
simplified. Read the full contract ↗
The rules, and the answers.
- One wallet, one stockroom. Only that wallet can add products or change stock.
- Stock can't go below zero. The app checks before sending and the contract refuses anyway.
- History is append-only. Each change stores the delta, the quantity after, a reason and the block time. There is no edit and no delete.
- Nothing else. No tokens, no payments, no admin keys, no personal data.
Why put inventory on-chain?
A spreadsheet can be changed after the fact and nobody would know. Here every restock, sale or correction is a BOT Chain transaction with its own timestamp, so the history only grows. A mistake is fixed by adding a correction, not by rewriting the past.
Who can see my stock?
Everyone. Data on BOT Chain is public, and anyone with your wallet address can open your read-only stockroom. Use demo products or things you're happy to show, and keep personal details out of product names.
Who can change it?
Only the wallet that owns the stockroom. The contract writes to the sender's own list, so there is no way to touch someone else's products.
Can I undo or delete a change?
No. Add a new change with the reason "Correction" instead. Both lines stay in the history.
What does it cost?
The app is free and takes no payments. Each change is one transaction, so you pay the BOT Chain network fee in BOT. Viewing is free.