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Abstract Interface Class Marker interface for signers that can hand back the raw private key to the user — primarily non-custodial email and phone signers. 
abstract interface class CrossmintExportableWalletSigner
Non-custodial signers normally keep keys inside a hidden WebView (the TEE/KMS runtime the Crossmint signer service manages). For recovery or migration flows, users can request the private key via a separate, purpose-built export bridge — that flow lives behind exportPrivateKey.

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Properties

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canExportPrivateKey

bool get canExportPrivateKey
Whether this signer can export its private key. Only non-custodial email/phone signers return true.

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Methods

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exportPrivateKey

Future<void> exportPrivateKey(CrossmintExportSignerBridge bridge)
Kicks off the key-export flow via the provided export bridge. The bridge renders a Crossmint-hosted UI that the user confirms inside. Throws CrossmintSignerException when the signer type does not support export.