Non-native blockchain signatures

A computer-implemented method of generating blockchain transactions for enabling quantum resistant signatures to be verified in-script, wherein the method is performed by a second party and comprises:

• generating a first blockchain transaction comprising a locking script, wherein the locking script comprises a first verification script and a second verification script, wherein when the locking script of the first blockchain transaction is executed together with an unlocking script of a second blockchain transaction:
• the first verification script is configured to verify a first signature based on a first public key corresponding to a first private key set equal to one, and to verify that a first component of the first signature corresponds to a first coordinate of an elliptic curve generator;
• and
• the second verification script is configured to verify a second signature based on the first signature, wherein the first signature is a native blockchain signature and the second signature is a quantum resistant signature;
• and
• causing the first blockchain transaction to be submitted to a blockchain network.

A non-transitory computer readable media comprising a computer program configured so as, when run on one or more processors, the one or more processors perform a method of generating blockchain transactions for enabling quantum resistant signatures to be verified in-script, wherein the method is performed by a second party and comprises:

• generating a first blockchain transaction comprising a locking script, wherein the locking script comprises a first verification script and a second verification script, wherein when the locking script of the first blockchain transaction is executed together with an unlocking script of a second blockchain transaction:
• the first verification script is configured to verify a first signature based on a first public key corresponding to a first private key set equal to one, and to verify that a first component of the first signature corresponds to a first coordinate of an elliptic curve generator;
• and
• the second verification script is configured to verify a second signature based on the first signature, wherein the first signature is a native blockchain signature and the second signature is a quantum resistant signature;
• and
• causing the first blockchain transaction to be submitted to a blockchain network.