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Add CrossChainBridge smart contract - #969

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BuildQubic wants to merge 2 commits into
qubic:mainfrom
BuildQubic:feature/2026-07-21-CrossChainBridge
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Add CrossChainBridge smart contract#969
BuildQubic wants to merge 2 commits into
qubic:mainfrom
BuildQubic:feature/2026-07-21-CrossChainBridge

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@BuildQubic

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This pull request introduces the CrossChainBridge.h smart contract (Index 5) for Qubic core.

Key features included:

  • Lock & Unlock asset workflows with 16-validator Schnorr signature verification.
  • Replay attack protection via transaction hash tracking buffer.
  • Circuit breaker pause state and configurable quorum thresholds.

@BuildQubic

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"Ready for review and CI checks when a maintainer has a moment! Thanks."

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"Code and unit tests updated and verified. Ready for core maintainer review when convenient!"

@BuildQubic

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"Updated CrossChainBridge.h to explicitly inherit from ContractBase to resolve the ContractVerify failure. The branch is updated and ready for maintainer review and CI approval. Thanks!"

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