What Does a Semiconductor Foundry Do?

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A semiconductor foundry manufactures chips for other companies, turning a circuit design into physical electronic devices. Its central job is to make the tiny structures and connections that allow a chip to work, then repeat that process reliably across many wafers. Some foundry services also include help with design, packaging and testing. The distinction matters because the company whose name appears on a processor does not necessarily own the factory that fabricated it. Chip design and chip manufacturing solve different problems. Designers decide what a device should do and develop the circuitry needed to achieve it. A foundry supplies a manufacturing process that can turn that circuitry into silicon. TSMC describes its dedicated foundry business as manufacturing customers’ products, rather than selling competing chip designs of its own. Companies that focus on design while contracting out fabrication are often called fabless. Other businesses combine chip design with their own manu...
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Why Does a Bitcoin Wallet Need a Private Key?

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Illustration of a protected key authorizing a signed document and linked ledger blocks

A Bitcoin wallet uses a private key to create digital signatures that authorize spending. The key is secret data, rather than a coin stored inside the phone or computer. Bitcoin’s blockchain records transactions; the wallet supplies the cryptographic proof needed to move funds.

A signature lets other computers check authorization without learning the private key itself. It is tied to transaction data, so changing the signed details makes that proof fail. This is how a network can check a payment without asking the sender to reveal the secret used to approve it.

Control of the key therefore matters as much as access to the wallet app. A person who obtains it can create valid signatures. Keeping signing keys separate from an internet-connected device is the principle behind offline and hardware-wallet designs.

Sources: Bitcoin’s transaction explainer and wallet developer guide.

 

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