Complete Guide to Bitcoin Runes in 2026 — Everything You Need to Know
Runes are Bitcoin's fungible token protocol, launched by Casey Rodarmor at block 840,000 on 20 April 2024 — the halving block. This guide is the practical side: what the protocol does mechanically, what operations cost, and what to check before you touch one.
The Mechanism in One Paragraph
Rune balances live in Bitcoin UTXOs, and instructions live in an OP_RETURN output called a runestone. Because OP_RETURN is provably unspendable, it can be pruned by nodes and never enters the UTXO set, which is the central design difference from BRC-20. A runestone carries three kinds of instruction: an etching creating a rune, a mint issuing units under the etching's terms, and edicts moving units from the transaction's inputs to specific outputs. Any runes not assigned by an edict fall through to the first non-OP_RETURN output, which is the safety net that stops accidental burns.
What Etching Locks In Forever
An etching sets the name, a single-character symbol, divisibility (decimal places, 0 to 38), the premine allocated to the creator, and the mint terms — amount per mint, total number of mints, and optional start and end block heights. None of it is changeable afterward. There is no admin key, no upgrade path and no governance mechanism. That immutability is the feature, and it also means a typo in the supply cap is permanent.
Names are A–Z separated by optional interpuncts (the · character), 1 to 28 letters. Shorter names unlock over time on a schedule that removes one minimum character roughly every four months from launch, so the pool of available short names keeps widening.
What It Costs
Every rune operation is an ordinary Bitcoin transaction, so the cost is transaction size multiplied by the fee rate. A simple mint is a small transaction — on the order of 150–250 vBytes. At 5 sat/vByte that is around 1,000 sats; at 100 sat/vByte during a congested period it is 20,000 sats or more. The protocol charges nothing itself. Check the current fee rate before minting, because minting a token worth $2 with a $15 fee is a mistake people make constantly during mempool spikes.
Rune IDs and Why They Matter
Every rune has an ID of the form block:tx — for example 840100:5 for the fifth transaction in block 840,100. Names can look alike; IDs cannot collide. Before buying, verify the ID, not the display name. Lookalike etchings using visually similar names are the most common scam in the space, and the interpunct makes near-duplicates easy to produce.
Runes vs BRC-20, Concretely
BRC-20 encodes JSON into ordinal inscriptions and requires an off-chain indexer to decide balances; two indexers can in principle disagree with no on-chain arbiter. Each operation also creates a UTXO the network must track forever. A BRC-20 transfer takes two transactions — inscribe, then send. A rune transfer takes one, and rune state is fully determined by consensus data. The longer comparison is in our Runes vs BRC-20 breakdown, and the full protocol walkthrough is in the complete Runes guide.
Wallets and Trading
Xverse, Leather, OKX and Magic Eden's wallet all handle runes alongside BTC and ordinals. Trading happens through Partially Signed Bitcoin Transactions: buyer and seller each sign their half and the swap either completes atomically or not at all, with no escrow. There are no automated market makers, so liquidity is order-book based — expect wide spreads on anything outside the top handful of runes, and check depth rather than last price before assuming you can exit a position.
Before You Interact With Any Rune
- Confirm the rune ID against the marketplace listing and the explorer, not the name.
- Check whether minting is still open and how much of the supply is premined — a 90 percent premine tells you who holds the exit.
- Watch the fee rate; wait for a quiet mempool for non-urgent operations.
- Use a wallet that shows you decoded runestone contents before signing, and read them.