Self-custody in one card: the SpaceM × Tangem wallet

Key takeaways

• Self-custody means you — not an exchange or platform — hold the keys to your digital assets.
• The SpaceM × Tangem wallet is a physical cold-storage card for $SPCM, CORE NFTs and other ecosystem assets. Tap to use; keys never leave the card.
• It works with all SpaceM products, including CORE NFTs.
• Self-custody reduces one big risk — a platform failing — but it moves responsibility to you. It is not risk-free.

Every few years the same story repeats: a platform that held people's digital assets stops working, and the assets go with it. The lesson is old and simple, and it is the reason the phrase "not your keys, not your coins" exists. This is a plain-language guide to what that means, and to the card SpaceM built with Tangem to make it easy.

What is self-custody?

A digital asset on a blockchain is controlled by a private key — a secret that proves you are allowed to move it. Whoever holds the key controls the asset. When you keep assets on an exchange, the exchange holds the key. When you self-custody, you hold it. That is the entire difference.

It sounds technical. In practice it comes down to one question: if the platform disappeared tomorrow, would your assets still be yours? With self-custody, yes. Without it, you are trusting someone else's answer.

Why it matters more in a participation ecosystem

SpaceM is built around participation: CORE seats, Membership, $SPCM, and RWD Vaults with terms you can read on-chain. Every one of those depends on you being able to act with your own assets — activate, commit, vote — and to verify what happened afterwards. If your keys sit with a third party, so does your ability to participate. Self-custody is what keeps the ecosystem's promise of "your position, your rules, your verification" true all the way down.

What is the SpaceM × Tangem wallet?

It is a physical card, the size of a bank card, that stores your private keys inside a secure chip. It is cold storage — the keys are generated on the card and never leave it, so they are never exposed to the internet. To use it, you tap the card on your phone. The Tangem page sums it up: your assets stay in your hands, not on an exchange or centralized platform.

• Stores and manages $SPCM, CORE NFTs and other ecosystem assets.
• Tap-to-use: manage and transfer tokens or NFTs via mobile integration.
• Compatible with all SpaceM products, including CORE NFTs.
• Built as a physical card for everyday reliability — no battery, no screen to break.

How it fits with the rest of SpaceM

Think of the card as the place your seat lives. Your CORE NFT sits on it. Your $SPCM sits on it. When a participation cycle opens, you act from it. When you activate Membership, the burn is signed by it. And when you want to check what happened, the record is on-chain, and the address is yours.

What self-custody does not do

It is honest to say this clearly. Self-custody removes one large risk — a platform holding your assets and failing — and replaces it with a responsibility: you are the one who must keep the card, and its recovery method, safe. Tangem does not remove all risk and does not make assets impossible to lose. Nobody can reset a private key for you. That is the trade, and it is a good one for most people, but it is a trade.

Frequently asked

What does "not your keys, not your coins" mean?

If someone else holds the private key to your digital assets, they control the assets. Self-custody means you hold the key.

Can I store CORE NFTs on the Tangem card?

Yes. The SpaceM × Tangem wallet is compatible with all SpaceM products, including CORE NFTs.

Does the card need charging?

No. It is a passive card with a secure chip; it works by tapping on a phone.

What happens if I lose the card?

Follow the recovery method you set up when you activated it. There is no central reset — that is what self-custody means.

Product details are on the SpaceM × Tangem page. For what a seat is, read CORE NFT and CORE Lite, explained.