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New PISA prototype cuts Bitcoin transaction fees by combining Payjoin privacy with signature aggregation.

Protocol Fundamentals
23 Oct 2026
Crypto Briefing
View Source
Bullish
New PISA prototype cuts Bitcoin transaction fees by combining Payjoin privacy with signature aggregation.

At Plan ₿ Week in Lugano, developers unveiled PISA, a prototype that merges Payjoin's privacy features with Cross-Input Signature Aggregation (CISA) to reduce Bitcoin transaction sizes and fees by 7–26%. Payjoin enhances privacy by combining inputs from multiple sources, while CISA aggregates signatures to shrink transaction data. Though promising, PISA relies on draft Bitcoin Improvement Proposals (BIP 458 and BIP 459) that are not yet activated, so the fee savings exist only in prototype form for now. The project offers wallet developers a reference for future upgrades, but its real impact depends on the adoption of these proposals and further developer feedback.

The PISA demo on Bitcoin transaction efficiency is the story's focus, with Pluang market data providing context for cryptocurrency trends. For readers following major cryptocurrencies on Pluang, as of Oct 23, 2026 21:21 WIB, 18 of 50 major cryptocurrencies rose while 31 fell. Notable movers include AVAX at Rp162.942 with 27% Sell / 73% Buy order activity, XNO at Rp6.187 with 13% Sell / 87% Buy, and ALGO at Rp1.928 with 20% Sell / 80% Buy.

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