Signing transactions

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Bitcoin

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Before a transaction can be sent to the Bitcoin network, each input must be signed.

Threshold ECDSA

Canisters can sign transactions with threshold ECDSA through the sign_with_ecdsa method.

To test canisters locally that use the following code snippets, you will need to enable local Bitcoin development. To do this, you can either start the local replica with dfx start --enable-bitcoin or you can include the following configuration in the project's dfx.json file:

motoko/basic_bitcoin/dfx.json

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See full example on GitHub

Learn more about dfx.json configuration options.

The following snippet shows a simplified example of how to sign a Bitcoin transaction for the special case where all the inputs are referencing outpoints that are owned by own_address and own_address is a P2PKH address.

Motoko

motoko/basic_bitcoin/src/basic_bitcoin/src/BitcoinWallet.mo

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See full example on GitHub

Rust

rust/basic_bitcoin/src/basic_bitcoin/src/bitcoin_wallet/p2pkh.rs

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See full example on GitHub

Threshold Schnorr

Canisters can sign transactions with threshold Schnorr through the sign_with_schnorr method.

Signing P2TR key path transactions

The following snippet shows a simplified example of how to sign a Bitcoin transaction for the special case where all the inputs are referencing outpoints that are owned by own_address and own_address is a P2TR address.

Rust

motoko/basic_bitcoin/src/basic_bitcoin/src/P2tr.mo

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See full example on GitHub

Signing P2TR script path transactions

The following snippet shows a simplified example of how to sign a Bitcoin transaction for the special case where all the inputs are referencing outpoints that are owned by own_address and own_address is a P2TR script path address.

Rust

rust/basic_bitcoin/src/basic_bitcoin/src/bitcoin_wallet/p2tr.rs

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See full example on GitHub

Learn more

Learn more about threshold ECDSA.

Learn more about threshold Schnorr.