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_posts/2025-12-15-KZGCommitment.md

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@@ -22,13 +22,12 @@ EIP-4844가 도입되면서, 새로운 트랜잭션 타입 `0x03`을 지정받
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# Dive into KZG Commitment
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**notation**
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$\mathbb{F}_q$: BLS12-381 Scalar Field
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$G_1$: BLS12-381 $G_1$ Group (48 bytes)
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$G_2$: BLS12-381 $G_2$ Group (96 bytes)
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$e$: Pairing e: $G_1 \times G_2 \rightarrow G_T$
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$\omega$: 4096th root of unity $\in \mathbb{F}_q$
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$\omega \equiv 1, \omega \neq 1$ for $0 < k < 4096$
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$\tau$: trusted setup에서 선택된 secret $\in \mathbb{F}_q$
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- $\mathbb{F}_q$: BLS12-381 Scalar Field
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- $G_1$: BLS12-381 $G_1$ Group (48 bytes)
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- $G_2$: BLS12-381 $G_2$ Group (96 bytes)
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- $e$: Pairing e: $G_1 \times G_2 \rightarrow G_T$
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- $\omega$: 4096th root of unity $\in \mathbb{F}_q$
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- $\tau$: trusted setup에서 선택된 secret $\in \mathbb{F}_q$
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## 1. Rollup data -> Polynomial
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L2 Sequencer는 우선 처음으로, blob에 넣을 rollup data를 Polynomial로 표현한다.
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이 과정을 통해 128KB의 rollup data를 단 48B 크기의 단일 $G_1$ 그룹 원소인 KZG Commitment $C$로 압축할 수 있다.
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이를 코드로 나타내면 아래와 같다.
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```python
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computed_kzg = bls.Z1 # 0 · G₁ (영점)
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temp = bls.multiply(point_kzg, value) # bⱼ · [Lⱼ(τ) · G₁]
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computed_kzg = bls.add(computed_kzg, temp) # 누적 합
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# 최종: C = P(τ) · G₁ (48 bytes)
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# 최종: C = P(τ) · G₁ (48 bytes)
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```

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