Cupcake by Cake Wallet challenges hardware wallets
The post Cupcake by Cake Wallet challenges hardware wallets appeared on BitcoinEthereumNews.com. A hardware wallet costs on average between 70 and 250 euros, as highlighted by updated price lists of solutions such as Ledger and Trezor; it requires shipping and may expose to supply chain risks. In September 2025, in this context, Cupcake proposes an alternative: using an unused phone as an air-gapped device to store private keys offline, with signing flow via QR and open-source code, as described by the official team of Cake Wallet and reported by the specialized press Bitcoin.com News. According to the data collected by our editorial team, informal tests on discarded phones show that QR signing is stable for standard transactions, with signing times on the order of a few seconds per frame under typical conditions; very large PSBT transactions may require more frames and a slightly slower scan. Industry analysts note that the air-gapped approach significantly reduces exposure to supply chain risks and physical tampering, while requiring greater operational discipline from the user. What is Cupcake and how it operates in air-gapped mode Cupcake is the “companion” app of Cake Wallet designed for offline key storage, kept exclusively on the isolated device. The online app (Cake Wallet) prepares the transaction in read-only mode, sends it to Cupcake via QR for signing, and once signed, publishes the result on the network. For Bitcoin, the typical flow is based on PSBT (Partially Signed Bitcoin Transactions, BIP‑174), a standard that facilitates signing on isolated devices. For Monero, the approach follows the practice of offline signing with unsigned transactions and out-of-band transfer, as explained in the official Monero documentation. Current Support: Bitcoin and Monero Currently, Cupcake manages Bitcoin and Monero, keeping the keys locally and not exposing them to the network, with a flow that balances privacy and operational convenience. Why it matters: costs, transparency, and reduced supply chain…
The post Cupcake by Cake Wallet challenges hardware wallets appeared on BitcoinEthereumNews.com.
A hardware wallet costs on average between 70 and 250 euros, as highlighted by updated price lists of solutions such as Ledger and Trezor; it requires shipping and may expose to supply chain risks. In September 2025, in this context, Cupcake proposes an alternative: using an unused phone as an air-gapped device to store private keys offline, with signing flow via QR and open-source code, as described by the official team of Cake Wallet and reported by the specialized press Bitcoin.com News. According to the data collected by our editorial team, informal tests on discarded phones show that QR signing is stable for standard transactions, with signing times on the order of a few seconds per frame under typical conditions; very large PSBT transactions may require more frames and a slightly slower scan. Industry analysts note that the air-gapped approach significantly reduces exposure to supply chain risks and physical tampering, while requiring greater operational discipline from the user. What is Cupcake and how it operates in air-gapped mode Cupcake is the “companion” app of Cake Wallet designed for offline key storage, kept exclusively on the isolated device. The online app (Cake Wallet) prepares the transaction in read-only mode, sends it to Cupcake via QR for signing, and once signed, publishes the result on the network. For Bitcoin, the typical flow is based on PSBT (Partially Signed Bitcoin Transactions, BIP‑174), a standard that facilitates signing on isolated devices. For Monero, the approach follows the practice of offline signing with unsigned transactions and out-of-band transfer, as explained in the official Monero documentation. Current Support: Bitcoin and Monero Currently, Cupcake manages Bitcoin and Monero, keeping the keys locally and not exposing them to the network, with a flow that balances privacy and operational convenience. Why it matters: costs, transparency, and reduced supply chain…
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