You mint a stem. It shows up as unrevealed.
No type yet. Could be drums. Could be strings. Could be a vocal that turns out to be the rarest in the song. You don't find out until reveal day.
Sounds gimmicky on paper. It's actually the most interesting market window stems.fm has, and the whitepaper goes into why.
What unrevealed actually means
When you mint, the contract hands you an ERC-1155 token with a placeholder metadata uri. The audio file, the type (drums vs vocals vs FX), the visual art. All of it is hidden until the project triggers the reveal.
Same token ID before and after. The metadata flips on reveal day. Nothing about your token changes onchain except the URI it points at.
Think mystery box, but the box can't be tampered with after the fact. The trait distribution was fixed at mint time. The reveal just exposes it.
Why ship them unrevealed at all
The whitepaper's framing: an unrevealed stem is a probability bet, not a known asset. The market has to price something it can't see.
“Streaming measures attention. Stems measures market conviction.”
For the first week or two of any drop, this is the active phase. Floor is set by people pricing on odds. Once reveals start, the floor shatters into bands by type. Drums get cheap, woodwinds spike.
That window is where most of the gains happen if you read it right.
How the odds actually shake out
Each release ships with a fixed distribution. The mint count for drums might be 200. The mint count for woodwinds might be 20. Everything is set in the contract before anyone mints anything.
Your unrevealed stem rolls against that distribution. If 80% of the supply is the common types like drums, bass, and FX, then 80% of unrevealed mints will reveal as those. The rare types are rare because there are fewer slots.
The exact distribution sits in the project's metadata before launch. Read it. The collectors who do better in the reveal window are the ones who know exactly what they're rolling against.
Flip versus hold
Two schools, both honest about what they're doing.
Flip crowd: list the unrevealed stem on OpenSea for a small premium over mint. Sell to someone who wants to gamble. Take the small win. Repeat next drop.
Hold crowd: keep the unrevealed and wait. If you reveal something rare, the floor for your specific type might be 3-5x mint. If you reveal common, you're holding something you could have minted anyway.
Neither is wrong. The flip is a sure smaller gain. The hold is a probability bet with a known payoff curve.
The mistake people make
Holding past reveal hoping the floor will move.
Once revealed, a common stem is priced like every other common stem. The mystery premium is gone. If you missed the flip window and revealed average, the value is what it is. Listing it 5x floor doesn't make it sell.
The market reprices fast on reveal day. Decide your move before that day, not during it.
Reading the odds in practice
- Check the project's metadata on Etherscan or stems.fm before mint. Look for type counts.
- Add up the rare types. Compare to total mint count. That percentage is your roll.
- A 10% rare-type roll on 1,000 mints means 100 rare stems will exist. That's the supply you're competing with if you reveal rare.
- The bigger the rare-type slice, the less rare actually means anything.
Bookmarks worth keeping
- Stems.fm /mint page during a drop, to see what's still mintable unrevealed
- OpenSea collection page filtered to unrevealed listings, for the flip market
- Etherscan to confirm the metadata uri before reveal (it'll be the placeholder)
- Whitepaper: "Stems: A New Layer for Valuing Music" by Kyler Simzer
The reveal window is the most active part of the cycle. If you understand the odds, it's the one place on stems.fm where being early pays clearly.
