https://github.com/ethereum/kzg-ceremony-specs

Specs for Ethereum's KZG Powers of Tau Ceremony
https://github.com/ethereum/kzg-ceremony-specs

eip4844 ethereum kzg powers-of-tau

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Specs for Ethereum's KZG Powers of Tau Ceremony

• Host: GitHub
• URL: https://github.com/ethereum/kzg-ceremony-specs
• Owner: ethereum
• License: cc0-1.0
• Created: 2022-06-02T15:49:26.000Z (over 2 years ago)
• Default Branch: master
• Last Pushed: 2023-02-03T08:36:01.000Z (almost 2 years ago)
• Last Synced: 2024-09-28T06:31:13.799Z (3 months ago)
• Topics: eip4844, ethereum, kzg, powers-of-tau
• Homepage:
• Size: 315 KB
• Stars: 109
• Watchers: 14
• Forks: 33
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Powers of Tau Specification

These documents comprise a specification for Ethereum's Powers of Tau (PoT) setup for use in [KZG commitments](https://dankradfeist.de/ethereum/2020/06/16/kate-polynomial-commitments.html) in [EIP-4844 (Proto-Danksharding)](https://eips.ethereum.org/EIPS/eip-4844) and ultimately [Full Danksharding](https://notes.ethereum.org/@dankrad/new_sharding).

The ceremony takes place between _participants_ and the _sequencer_.  _Participants_ are the entities that contribute their secret randomness to the final output $\tau$ s. The role of the _sequencer_ is to act as the common point of interaction for all participants as well as verifying participants' contribution as the ceremony progresses.

## Table of contents

* [10,000 ft Overview](#10000-ft-overview)

* Cryptography

    * [BLS](./docs/cryptography/BLS.md)

    * [SDK](./docs/cryptography/sdk.md)

* Contributions

    * [Object Definitions](./docs/contribution/contribution.md)

* Sequencer

    * [Requirements](./docs/sequencer/sequencer.md)

    * [Contributor Qualification](./docs/sequencer/contributorQualification.md)

    * [Contribution Queuing](./docs/sequencer/queueStrategy.md)

    * [API Definition (Open API + JSON Schema)](./apiSpec)

* Participant/Client

    * [Requirements](./docs/participant/participant.md)

    * [API Lifecycle](./docs/participant/lifecycle.md)

* [Initialization](#initialization)

## 10,000 ft Overview

We are performing a ceremony to generate Powers of Tau for KZG proofs on Ethereum. The output of the ceremony consists of 4 (distinct) sets of Powers of Tau each with a different maximum power:

1. $([\tau_1^0]_1, [\tau_1^1]_1, \dots, [\tau_1^{2^{12}-1}]_1])$, $([\tau_1^0]_2, [\tau_1^1]_2, \dots, [\tau_1^{64}]_2])$

2. $([\tau_2^0]_1, [\tau_2^1]_1, \dots, [\tau_2^{2^{13}-1}]_1])$, $([\tau_2^0]_2, [\tau_2^1]_2, \dots, [\tau_2^{64}]_2])$

3. $([\tau_3^0]_1, [\tau_3^1]_1, \dots, [\tau_3^{2^{14}-1}]_1])$, $([\tau_3^0]_2, [\tau_3^1]_2, \dots, [\tau_3^{64}]_2])$

4. $([\tau_4^0]_1, [\tau_4^1]_1, \dots, [\tau_4^{2^{15}-1}]_1])$, $([\tau_4^0]_2, [\tau_4^1]_2, \dots, [\tau_4^{64}]_2])$

### BLS Cryptography

Due to a lack of standardisation for a complete API for BLS curves, we define our own in [BLS.md](./docs/cryptography/BLS.md).

### Contributions

Due to the simplicity of this PoT setup, the full contribution is sent as a json file between the sequencer & participants. This allows the use of a RESTful API between the two. See [contribution documentation](./docs/contribution/contribution.md) for

the contribution format requirements.

## Initialization

The ceremony is initialized to [initialContribution.json](./initialContribution.json).