Frequently Asked Questions

# Where do I find the source code?

In the GitHub repository.

# How do I add an initial stack to a script?

You can push the required stack items at the beginning of a script.

# How does the script debugger differ from Bitcoin Core's script interpreter?

Here is a non-exhaustive list of differences:

• Because we're executing scripts without knowing the rest of the transaction, several opcodes behave differently:
  • All signature-checking opcodes succeed on non-empty signatures and public keys. Consequently, OP_CODESEPARATOR does not do anything.
  • OP_CHECKLOCKTIMEVERIFY and OP_CHECKSEQUENCEVERIFY succeed on any valid locktime value.
• Stack limits and the opcode limit are not enforced.
• Both OP_CHECKMULTISIG and OP_CHECKSIGADD are implemented and can be used in the same script, which wouldn't normally be possible.
• Standardness rules are not enforced, though some are implemented as warnings.