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WFN QUICK BRIEF · UNDER 1 MIN
The short version
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What the primary record establishes
EIP-2935, included in Pectra, places recent execution block hashes in a system contract. Each processed block records its parent’s hash. The existing BLOCKHASH opcode retains its previous behavior. Ethereum EIP-2935 ↗Ethereum Pectra specification ↗
What the distinction changes
At block N the contract accepts 32-byte block numbers from N−8191 to N−1. The ring buffer takes time to fill after activation. With a full buffer at height 100,000, block 92,000 falls inside the system contract’s window and outside the opcode’s 256-block window.
What to check before drawing a conclusion
A stored hash identifies a block header. Applications still need evidence that a specific transaction or state belongs to that block, and must establish finality where required. A proof that depends on the buffer has a deadline set by the source block’s age.
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Original WFN vector illustrationWFN · 6 November 2026
Editorial noteSource-based explanation with original WFN analysis. Historical records retain their dates; numerical examples are illustrative. The original vector illustration is conceptual and is not documentary evidence.
WFN REALITY LEDGER
What is on the record?
Primary-source explainer
Primary-source explainer
Primary record / reference periodEthereum EIP-2935
The linked source supports the documented record; WFN interpretation and illustrative examples are separate.
01 · VERIFIED RECORD
What the primary record establishes
EIP-2935, included in Pectra, places recent execution block hashes in a system contract. Each processed block records its parent’s hash. The existing BLOCKHASH opcode retains its previous behavior. Ethereum EIP-2935 ↗Ethereum Pectra specification ↗
02 · WFN EDITORIAL ANALYSIS
What the distinction changes
At block N the contract accepts 32-byte block numbers from N−8191 to N−1. The ring buffer takes time to fill after activation. With a full buffer at height 100,000, block 92,000 falls inside the system contract’s window and outside the opcode’s 256-block window.
03 · REVIEW POINTS
What to check before drawing a conclusion
A stored hash identifies a block header. Applications still need evidence that a specific transaction or state belongs to that block, and must establish finality where required. A proof that depends on the buffer has a deadline set by the source block’s age.
