Bitcoin ABC 0.34.0 Release Notes

Bitcoin ABC version 0.34.0 is now available from:

This release includes the following features and fixes:

A bug has been fixed in proof-manager-cli that could incorrectly report an invalid Avalanche proof delegation as valid.

Network upgrade

At the MTP time of 1794744000 (November 15, 2026 12:00:00 UTC), the following changes will be activated:

Bump automatic replay protection to the next upgrade, timestamp 1810382400 (May 15, 2027 12:00:00 UTC).

To stay in sync with the network, node operators must update to version 0.34.x before the November 15, 2026 upgrade is activated.