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feat(blockchain): BlockCtx.ProducerPubKey + GetByBLSPubKey lookup (Y4a foundation) - #4857

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feat(blockchain): BlockCtx.ProducerPubKey + GetByBLSPubKey lookup (Y4a foundation)#4857
envestcc wants to merge 11 commits into
iotexproject:masterfrom
envestcc:bls-producer-identity-y4a

Commits on May 27, 2026
- feat(consensus): plumb BLS producer keys + add aggregation feature gate (IIP-52)
  
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Commits on May 28, 2026
- feat(consensus): BLS endorsement signing for IIP-52
  
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- feat(consensus): BLS endorsement receiver path for IIP-52
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- test(consensus): unit coverage for BLS endorsement sign/verify dispatch
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- refactor(consensus): address PR #4843 review feedback
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Commits on May 29, 2026
- refactor(consensus): fold BLS pubkey lookup into delegatesByEpochFunc
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- refactor(consensus): roundCtx.Delegates() returns []*Delegate
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Commits on Jun 3, 2026
- feat(consensus): BlockFooter aggregation for IIP-52
  
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Commits on Jun 4, 2026
- feat(block): length-based dispatch for Header signature scheme
  
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Commits on Jun 8, 2026
- refactor(block): replace raw []byte with narrow Verifier interface
  
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Commits on Jun 11, 2026
- feat(blockchain): BlockCtx.ProducerPubKey + GetByBLSPubKey lookup (Y4a)
  
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  committed
  637a1bb