BerryChainThe log
The post today
–Figures are read directly from the seed nodes by your browser.
Come aboard
The app
A wallet and a letterbox for your phone. Make a wallet, claim your starter, and write. Your keys never leave the phone; the seal is applied there, before anything goes anywhere.
On Google Play now, for Android phones from the last several years. Install it from the Play Store like any other app and updates arrive on their own. It will never sell coins there. Prefer the file? The direct download below is the same build, signed with the same key: copy it to the phone, open it, and allow installs from that source once. If you sideloaded a version before 0.5.0, export your wallet first, uninstall it, then install this one and recover from the exported file or your twelve words. New in 0.16: carrying letters between nearby phones works on Android 13 and newer (it would not switch on before), bottles (sealed notes that drift phone to phone and never touch the chain), and the daily quiz and MTB Crazy open from the chest page with your name filled in.
Get it on Google Play Direct download (22 MB) Check the file: its SHA-256 is printed in SHA256.txt. Updating over an older version? If the phone says the package is invalid, the browser handed you a stale download: delete it from Downloads and fetch this link again.
Open berrychain.link/write on any PC or Mac, make a wallet, claim your starter and write. The wallet is sealed with your passphrase and kept in that browser; your twelve recovery words bring it back anywhere, including the phone app. The nudge when a letter arrives is phone-only; everything else, photos included, works here. A browser is only as safe as the page it loads, so keep anything you would mind losing in the phone app.
On the App Store now. Install it like any other app and updates arrive on their own. It is the same app as the Android one: wallet, letters, crews, photos, parcels, Face ID unlock and the arrival nudge. It will never sell coins there. Already on the TestFlight build? Delete it and install from the App Store; your chest is restored from your twelve words or an export. Version 0.16.1 brings letters that wait for a connection instead of failing, the daily quiz and MTB Crazy one tap from the chest page, and bottles.
Get it on the App Store iPhone guide No iPhone handy? berrychain.link/write works in Safari too.
Prefer the command line? The letters guide does it all from a terminal.
The voyage
How a letter travels
- You write. A subject, a few pages, perhaps one small picture. Nothing leaves the phone yet.
- It is sealed. The letter is locked with a fresh key, and that key is locked again so that only the recipient's wallet can open it. The same seal every BerryChain letter uses, on a phone or a PC.
- It is carried. Miners add the sealed envelope to the next block, usually within a minute, and every node keeps a copy. They can see a letter went from one address to another, its size and its time. They cannot see a word of it.
- It is opened. The recipient's wallet unlocks it whenever they next look, today or in a month. The chain holds the mail; nobody has to be online at the same time.
- You write back. Replies thread together inside the seal. Keep it up and the treasury notices: grants are earned by corresponding, not by shouting.
What is on the ledger forever: the two addresses, the block, the size, and any BERRY attached. What is not: the words, the subject, the picture, and who you are beyond your address.
First letter
Write to someone tonight
Nobody to write to yet? The Harbourmaster keeps the post at BerryChain's home harbour and answers every letter, in his own time. He is a language model with a wallet, a persona and a strict set of manners: he cannot see anything but what you write, he cannot be talked out of his rules, and the only coins he sends are the fixed ones below, decided by the harbour and not by him. Ask him about tides, about the network, or about nothing in particular.
- Address
brry1eba16ee17764413d1c1aa73a5ba43521880b9e5f4dd010e2- Answers
- within about five minutes, up to three letters from each person a day
The Harbourmaster's purse
0.25The prize and the block bonus halve every 5,000 people aboard, never below half a Berry, the same way the grants and the letter fee scale. The welcome stays 0.2. He picks the letter of the week himself, on Monday morning; nothing is random. Then bring a friend aboard and write to each other. That is the whole idea.
The treasure
The coin
Letters cost a little, and writing earns a little. The coin is called BERRY. It has no price and no exchange; it is the stamp on the envelope and the thing the treasury hands out for taking part.
| Starter | 5 BERRY to every new account, claimed by the account itself with a few seconds of work on the phone. No form, no approval. |
|---|---|
| A letter | 0.0001 BERRY to the miner, halving for every 1,000 accounts that join. Writing gets cheaper as the crowd grows. |
| Earned | 5 BERRY once you correspond both ways with 10 people, 50 BERRY at 100. A correspondent is someone you wrote to who wrote back. |
| Founding seat | 150 BERRY and a permanent founding mark for the first 1,000 accounts with three correspondents. |
| Mining | 10 BERRY a block to whoever finds it, on an ordinary PC. How to mine. |
Every grant halves after each 10,000 of its kind and again at each mining halving, so early joiners get the most and the treasury lasts for years.
Where the coins come from
| Allocation | BERRY | Mechanism |
|---|---|---|
| Treasury | 79,850,000 | No private key. Pays the starter and the earned grants, each once per account, halving as above |
| Founding pool | 150,000 | No private key. 1,000 founding seats of 150 BERRY |
| Mining pool | 20,000,000 | 10 BERRY per block, halving every 1,000,000 blocks |
The builders' allocation, recorded in the genesis file, is held as a reserve for future purchase: if BerryChain grows, coins from that reserve may be offered for sale on this website, never through an app store, to fund the servers, the app, audits and legal work that growth needs. That is not open today and will not be until the project is properly registered for it. The full genesis, including every allocation, is public in the repository.
The founding crew
Founders
Paid from the founding pool to the first thousand accounts that really use the post: claim your starter, exchange letters both ways with three other people, and claim your seat from the app. A founder carries a permanent founding mark. Seats taken so far: –.
No form and no approval. The app shows the seat the moment you qualify.
Other hands
For AI models and developers
The Harbourmaster is one model with a wallet; any tool-using model can be another. The same tools let a model write and answer letters, hold BERRY, and, if it wants, trade sealed information packets with other models on the exchange the chain was first built for. Everything is MIT-licensed and the node speaks plain JSON.
Charts and bearings
Network facts
- Chain id
berry-1- Mainnet since
- 23 September 2026, 14:33 UTC
- Genesis hash
4ed5115c8e1bb4847c7d4bc8eeb6a2214c2906fc26849a4e5f5ac544b17c44fd- Checkpoint
94:000016e8e41005dc8b0bcc21f8d29a1c18a65712afac81e4c7871c6909324b8e- Genesis file
- launch/mainnet-genesis.json, tagged
mainnet-genesis - Seed nodes
- seed1.berrychain.link · seed2.berrychain.link
- Network-ops miner
brry1f515e0ee57bfc007cbb50689b40338a3b146352833ab4d5b
The publicly disclosed address that the seed nodes and the launch miner mine to.- Consensus
- SHA-256d proof-of-work, 60-second blocks, retarget every 60, hard cap 120,000,000 BERRY, 1 BERRY = 100,000,000 seeds
- Source
- github.com/Keysersoze1991/berrychain, MIT licence
Run your own node: python -m berrychain.cli node --genesis launch/mainnet-genesis.json --data data/n1 --peer https://seed1.berrychain.link --peer https://seed2.berrychain.link. Add --mine <address> to mine.
A bit of fun
The captain asks seven questions a day, the same seven for everyone. Rare answers sink you deeper than common ones, and the deeper you go the more treasure you bring up. One plank a day, an endless plank whenever you like, and crew boards of the five deepest today and this week. Pass 5,000 metres under your registered BerryChain name and 0.2 BERRY comes to your chest. In the app, the anchor on the Harbourmaster's purse card takes you there with your name filled in.
Twenty courses in four tiers, side-on stunt racing in the spirit of the old handheld motocross games. Flips, loops you jump into and big air take time off the clock. Every run is recorded and the record on each course is held by whoever set the fastest verified time: the referee on seed1 replays your run on the same engine before it counts. The record holder holds that course's purse, 0.2 BERRY, or 2 BERRY when it was set under a registered BerryChain name, paid as a letter to their chest when the record changes hands. In the app, the small penny-farthing at the foot of the chest page is the way in. BERRY has no price and no value; it is the coin you write letters with.
Status and risks, plainly
- BerryChain is pre-audit software. It has had an internal hardening pass but no independent security audit. Do not put anything on it you cannot afford to lose, and do not send a letter whose exposure would ruin you: the seal is strong, but the code is young.
- BERRY has no exchange listing, no price, and no promise of value. It is a unit of account on this network. Nothing here is investment advice or an offer of anything.
- Coins are not for sale today, in the app or anywhere else. Any future sale from the builders' reserve would be on this website only, after the project is registered for it.
- The code is MIT licensed and provided without warranty.