Checkpoint

Introduction

...d at that specific position in the chain by recomputing the hashes from a known checkpoint. Because SHA-256 is cheap to verify in parallel but expensive to generate seque...

Network Design

...mits a transaction, it includes a recent blockhash (a reference to a recent PoH checkpoint) that serves as a transaction lifetime marker. The transaction is valid only fo...

Proof of History

...cation (parallel, multi-core): Core 1: hash_0 → ... → hash_999 ✓ matches checkpoint Core 2: hash_1000 → ... → hash_1999 ✓ matches checkpoint Core 3: hash_2000 ...

Proof of History Sequence

...hash_205) -- ... 300 SHA256(hash_299) -- (checkpoint) ``` Multiple data items can be inserted at the same PoH index by hashing them...