A method performed by a node of a blockchain network, comprising: accessing the locking script from a first transaction on the blockchain; receiving a second transaction not yet on-chain, the second transaction comprising an unlocking script; extracting from the first transaction or another transaction on the blockchain, a portion of code formulated in a second language other than a first language used for the locking and unlocking scripts; running the extracted portion of code in the second language, wherein as a result thereof the code generates at least one value; writing this value to a storage location readable by the locking script; and running the locking script together with the unlocking script in order to validate the second transaction, wherein the unlocking script is configured to read the first value from said storage location, and a condition for validation according to the locking script is dependent on the first value.