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2. The Signer Type & Authorization

Verified account ownership in Move.

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The `signer` type represents an account that cryptographically authorized the transaction. Only a `&signer` can publish resources into its account storage via `move_to`.

move
public fun assert_is_admin(account: &signer) {
    assert!(signer::address_of(account) == @admin, 100);
}

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Check your understanding

1. What does the signer type represent in Move?
An authenticated account authority backed by a transaction signatureA string public keyA validator nodeA database cursor
2. Can a Move program forge or create a fake signer value out of thin air?
No, the VM only creates signer values from validated transaction signaturesYes, using signer::createOnly in public functionsOnly on devnet

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