Cryptographic signatures

The signature type is used for Tezos signatures (edsig, spsig). Signatures are created by casting a string. Beware of failure if the signature is invalid.

Here is how you can define a signature:

const my_sig: signature =

"edsigthTzJ8X7MPmNeEwybRAvdxS1pupqcM5Mk4uCuyZAe7uEk68YpuGDeViW8wSXMrCi5CwoNgqs8V2w8ayB5dMJzrYCHhD8C7" as

signature;

Verifying signatures

Sometimes a contract needs to check that a message has been signed by a particular key. For example, a point-of-sale system might want a customer to sign a transaction so it can be processed asynchronously. You can do this in LIGO using the key and signature types.

⚠️ There is no way to generate a signed message in LIGO. This is because that would require storing a private key on chain, which defeats the purposes of a private key.

This example shows how to verify that a message was signed by a specific public key:

const check_signature =

(pk: key, signed: signature, msg: bytes) =>

Crypto.check(pk, signed, msg);