Block Adds Bitcoin Lightning to x402 Standard

Block has merged a Lightning payment specification into the x402 standard repository, updating that standard to include Lightning payment features. The merge places the Lightning payment format inside x402's codebase, signaling an intent to standardize Lightning-related payment data within that specification. Alongside the merged specification, contributors have produced a Python implementation that corresponds to the new Lightning payment format. That implementation has not yet passed through review or undergone testing against live nodes, and therefore its operational readiness is still unconfirmed. Because the Python code awaits review and real-node validation, developers seeking to adopt the x402 Lightning spec should note that practical interoperability tests are outstanding. The merged repository entry documents the specification itself, but wider ecosystem support will depend on subsequent implementation reviews and live-network testing. Next steps implied by the current status include completing code review, performing tests against real Lightning nodes, and updating implementations based on test outcomes. Until those tasks are finished, the x402 repository contains the formal specification but lacks an independently validated, production-ready reference implementation.