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Prototype PISA cuts Bitcoin transaction size by combining Payjoin and signature aggregation.

Protocol Fundamentals
24 Oct 2026
Tokenpost
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Prototype PISA cuts Bitcoin transaction size by combining Payjoin and signature aggregation.

A new Bitcoin prototype called PISA combines Payjoin and cross-input signature aggregation to reduce transaction size by 16 virtual bytes using a single 64-byte aggregate signature for two inputs. Developed at the Plan ₿ event in Lugano with support from Cypher Tank, the demo aims to improve privacy and efficiency by weakening input ownership assumptions and reducing signature data size. Currently, PISA runs only on Bitcoin's test network and requires specific software updates, so it is not yet ready for real transactions. The project remains experimental but shows potential for future Bitcoin transaction optimizations.

The PISA Bitcoin prototype demo is the subject, with Pluang market data providing context for cryptocurrency trends. As of Oct 24, 2026 12:21 WIB, out of 50 major cryptocurrencies priced on Pluang, 8 rose and 41 fell. Notable movers include SUSHI at Rp3.773 with a 3.79% decline, GRT at Rp423 down 3.50%, and XNO at Rp5.952 with a full sell order activity of 100%.

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