Anyone holding the Bitcoin token allBTC on the Cosmos exchange Osmosis has, since September 9, 2026, owned less Bitcoin on paper than the portfolio display promises. Around 36 percent of the
Anyone holding the Bitcoin token allBTC on the Cosmos exchange Osmosis has, since September 9, 2026, owned less Bitcoin on paper than the portfolio display promises. Around 36 percent of the backing stands without real assets behind it, caused by a single one of the five bridge versions that converge in this pooled token, and it applies no matter which version you deposited yourself. This guide shows you how to recalculate your own share, what the announced vote means for you, and how to tell in future whether a token is genuinely backed by Bitcoin.
Nomic operates a blockchain of its own that carries Bitcoin into the Cosmos ecosystem across a bridge. The token issued there is called nBTC and is meant to be backed one to one at all times by real Bitcoin held on the Bitcoin blockchain.
A double-spend describes the case in which the same unit of money is spent twice although it exists only once. According to Osmosis, that is exactly what became possible here: a flaw in Nomic's own forwarding mechanism allowed a single deposit to generate multiple vouchers and send them on to Osmosis, where they were exchanged for properly backed holdings.
Osmosis said on September 9, 2026 that neither its own chain nor the Inter-Blockchain Communication protocol had been compromised, and that the flaw sat in Nomic's forwarding logic. The distinction matters, because it confines the damage to one component. For you as a holder it changes little about the outcome at first, as the next section shows.
The exchange then froze the minting of new allBTC, the redemption into individual bridge tokens, and deposits and withdrawals across the affected rail. Trading in the Bitcoin pools carried on with a risk notice attached.
Alloyed assets are an Osmosis construct that fuses several technically distinct versions of the same underlying into a single tradable token. Instead of running four or five competing Bitcoin tokens side by side, each with its own liquidity, there is one common pot and a share certificate on top of it. That share certificate is called allBTC.
The thinking behind it is practical: liquidity does not splinter, prices do not drift apart, and traders need not know which bridge a given Bitcoin once entered through. The price of that convenience is shared liability, and this case makes it visible for the first time.
According to several trade publications, five versions flow into the pot behind allBTC: Wrapped Bitcoin in two variants, a Coinbase Wrapped Bitcoin bridged via Axelar, ckBTC from the Internet Computer ecosystem, and Nomic's nBTC. Which of them actually sat in the basket on the reference date, and in what quantity, we counted ourselves.
This survey was carried out by cryptoticker.io on September 11, 2026. Method: via a public Osmosis node we queried the circulating supply of the allBTC token and every balance held by the address that holds the backing basket; the eight positions found were then resolved individually through the IBC origin query and assigned to their respective underlying assets. Eight basket positions and one circulating supply were checked, each retrieved with HTTP status 200.
The result in figures:
Adding the first four positions together produces 70.73128010 Bitcoin of backing whose origin does not run across the bridge in question. Set against 110.57 share certificates in circulation, that is a backing ratio of 63.97 percent. The shortfall comes to 39.83966422 Bitcoin, or 36.03 percent. At the price of 66,928 euros per Bitcoin reported by CoinGecko on September 11, 2026, that is around 2.67 million euros; calculated in US dollars at 77,673 dollars per Bitcoin, around 3.09 million.
The figures match what CryptoSlate and The Crypto Times published independently of one another; both cite 70.73 Bitcoin of valid backing and a 36.03 percent shortfall, while earlier reports still put the figure at around 30 percent. The range stems from the share being revised upwards in the course of disclosure.
What we could not check: whether the four remaining positions are themselves fully backed by real Bitcoin. That is a question for the respective custodians and cannot be answered on the Osmosis chain. Three minimal entries in the basket clearly belong to other projects and carry no Bitcoin reference; they were taken out of the calculation.
The backing of a bridge token is no matter of faith: circulating supply and basket holdings sit publicly on the chain and can be set against each other. Here lies the point that sets this case apart from an ordinary bridge incident. Anyone who brought their Bitcoin to Osmosis through Wrapped Bitcoin or through cbBTC never had anything to do with Nomic. They carry the shortfall all the same.
The reason is the fungibility of the share certificate: all allBTC are interchangeable and entitle their holders to the same proportional claim on the same pot. There is no marking that identifies one certificate as a Wrapped Bitcoin deposit and another as an nBTC deposit. If a third of the pot is missing, it is missing from everyone in equal measure.
Osmosis did not build this wrong. Shared liability is the flip side of the very convenience depositors chose deliberately. Whoever wants no part of that liability pool has to stay one level lower and hold the individual bridge version, rather than handing it into the pooled token. We observed the same mechanism in a different form at the Liquid Network and described it on September 7, 2026 in our survey of the backing behind L-BTC.
In practice that means a glance at a token's name says nothing about its risk. What counts is how many parties stand between you and the real Bitcoin, and whether their failures reach through to you. Keeping that chain short is hard to do without holding the coins yourself.
An emergency update managed to pin down 22.65060846 Bitcoin at the address before they could be moved on. At the reference-date price that is around 1.52 million euros. Osmosis has announced that it will put a proposal to OSMO holders to seize this amount and close the remaining gap out of the Bitcoin holdings of the community pool.
Working that through, a successful seizure would leave a residual gap of 17.18905576 Bitcoin, or around 1.15 million euros by our survey. Only once that part is covered as well will a full Bitcoin stand behind every allBTC again.
A vote in the Cosmos ecosystem typically runs over several days, and it can fail. For as long as it runs, minting and redemption stay frozen, and the traded price of allBTC can diverge from the Bitcoin price because the market is pricing in the uncertainty. Anyone selling in this phase is not selling a Bitcoin, but a claim on a pot with a known gap.
Do not count on a community pool absorbing every failure. It has a size, it belongs to the token holders, and its use is decided afresh every time.
Open your Cosmos wallet and check whether your Bitcoin holding is listed as allBTC or as one of the individual versions. Pooled tokens on Osmosis carry the prefix "all". If it says nBTC, WBTC or cbBTC instead, you hold the individual version and are not exposed to the shared liability; in the case of nBTC, however, you are directly exposed to the bridge in question.
Many users do not hold allBTC as a free balance at all, because they have placed it into a liquidity pool. Those shares often appear in the wallet under a different name. Go through the pool overview and note every position in which allBTC forms one of the two sides.
Multiply your allBTC holding by 0.6397. The result is the amount of Bitcoin that actually stands behind your share as of September 11, 2026. For two allBTC that is 1.2794 Bitcoin. If the seizure of the frozen holdings succeeds, the factor rises to about 0.8446.
Record which holding and which backing ratio you entered the voting phase with. That note will help you later with the tax treatment of a possible loss and with any query you put to support.
A Bitcoin on the Bitcoin blockchain belongs to whoever holds the private key. A bridge token, by contrast, is a promise: a real Bitcoin sits somewhere, and somebody guarantees you will get it back. Between the two stand a custodian, a contract and, in case of doubt, a vote.
That distinction reaches all the way into valuation. If a bridge fails, the Bitcoin price is untouched by it, while your token is not. Conversely, a rising Bitcoin price does you little good if the claim behind it can only be served to 64 percent.
For everyday use a simple rule follows from this: amounts you intend to leave untouched for months belong on an address you control yourself, or with a supervised provider operating under a clear legal framework. Which trading venues in the EU hold an authorisation under the MiCA crypto regulation, we have compiled in our overview of regulated crypto exchanges. Bridge tokens are tools for a particular purpose on a particular chain, and no place of storage.
22.65 Bitcoin are stuck fast; OSMO holders decide on their seizure, and the rest of the gap would have to come out of the community pool. The pattern is not confined to Osmosis. Wherever several origins of the same underlying are bundled into one interchangeable share certificate, the same liability pool arises. That holds for liquid staking tokens that spread deposits across several operators, as it does for vault products running various strategies under one token.
The question to ask is always the same: how many independent sources of failure feed the pot, and which of them could damage the entire share certificate on its own? A basket with five inflows is only as stable as its weakest inflow, once the certificate stops distinguishing between them.
A look at the proportions helps too. A position making up more than a third of a basket deserves a check of its own before you buy in. In the present case nBTC stood for a good 36 percent, and that is precisely the share now missing.
The chronology shows that more than two months passed between the first conspicuous activity and the public announcement. According to the analysis of an independent on-chain analyst, reproduced by CryptoSlate, the substantial minting activity took place as early as June 25, 2026, with further activity on July 17.
At the start of September the signs then multiplied. On September 6, according to The Crypto Times, Nomic's last Bitcoin checkpoints ran; a day later the chain apparently came to a standstill. On September 8 the analyst published his transaction trail, and on September 9 at 09:48 UTC the official Osmosis statement followed.
For you, one thing about this matters above all: a gap in the backing can persist for months without the price or the interface giving anything away. A regular check of your own replaces no security guarantee, but it shortens the time you spend in the dark.
The circulating supply of an Osmosis token and the balances of an address can be retrieved through any public node on the chain. Those who would rather not do it themselves will find the processed figures in the ongoing coverage, for instance at CryptoSlate and at The Crypto Times.
A full report on the course of events was still outstanding on September 11, 2026, as was a detailed statement from Nomic on the forwarding logic. It is also unclear whether the community pool holds enough Bitcoin to close the residual gap, and how a possible seizure would be classified in legal terms.
Equally open is whether redemption into individual bridge versions will reopen at the original ratios after the vote, or whether depositors will bear a proportional haircut. Until that is settled, every figure in this article has the character of a snapshot.
(As of September 11, 2026. This article is not investment advice. Prices and fee structures change; check the terms with the provider before you buy.)
