BLACKCOIN / PROTOCOL V4ROADMAP

ROADMAP / HEIGHTS CONTROL

Protocol milestones and release history

Protocol V4 consensus milestones activate at the block heights below. Software release dates do not change those heights. The source-derived schedule is documented in /api/chain-params; the detailed transition timeline is on the migration page.

30.1.5.1 release summary

The 30.1.5 release closed the claim-recovery, signing-authority, wallet-load, and related hardening work tracked in issues #37, #44, #47, #48, and #52. The published 30.1.5.1 maintenance release completes the three remaining capacity issues below.

  • #54: More room for retained claims: The finite retained-claim topology work ceiling rises from 4,096 to 16,384 units, preserving the history needed to decide whether mining can safely continue.
  • #55: Precise confirmed-parent accounting: At a confirmed-parent boundary, claim accounting charges only the referenced output. Inactive ancestry still receives full accounting; safety checks are not skipped.
  • #56: Better support for larger wallets: Complete wallet-wide input selection gets its own capacity budgets instead of sharing the smaller claim-graph budget, while preserving stake reserves, coin locks, and final tip checks.

Release scope completed: issues #54, #55, and #56 are closed as completed following publication on September 12, 2026. The signed publication receipt records artifact verification and issue-closure evidence; merged PR #57 records the implementation. This release does not change the consensus milestones below.

Read the complete 30.1.5.1 changes, compatibility notes, and upgrade checklist →

Scheduled consensus milestones

  • #5,945,000Whitelist snapshot: Balances ≥ 10,000 BLK are snapshotted for Gold Rush eligibility.
  • #5,950,000Protocol V4 + Gold Rush start: The V4 accounting overlay and the Gold Rush shadow-claim phase activate.
  • #5,993,200Competing-claim rule: The first scheduled differing rule resolves conflicting Gold Rush claims. Activation at or above this height is not proof of a branch split; compare exact hashes and rule sets.
  • #6,192,999Gold Rush final block: The last block of the Gold Rush accounting phase.
  • #6,193,000Migration start: Legacy outputs can migrate to the Protocol V4 model. Authenticated unspent Gold Rush credits may become spendable when output maturity and all applicable consensus and authorization conditions are satisfied; this does not start a new blanket maturity period.
  • #6,921,999Migration final block: The last block of the Migration window.
  • #6,922,000Legacy path lockout: The legacy elliptic-curve spend path closes; decide migratetoquantum support before this height.

Track live progress toward each height on the observatory and migration timeline. Block heights govern each boundary.

Development & governance