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Oct 2, 2026
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Update ERC-8329: Move to Last Call #2023

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190acc9
Move ERC-8329 to Last Call
david-hay Sep 21, 2026
c628e56
docs(erc-8329): address final review feedback
david-hay Sep 30, 2026
ee011a0
Update ERC-8329: Extend Last Call deadline
david-hay Oct 2, 2026
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44 changes: 14 additions & 30 deletions ERCS/erc-8329.md
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Expand Up @@ -4,7 +4,8 @@ title: Subject-Linked Impact Snapshot Log
description: Defines append-only subject-linked impact snapshots with correction provenance, methodology versioning, and attestations
author: Chris Turner <c.turner@kula.com>, David Hay (@david-hay), Reagan Simpson (@krumg111), Collins Musyimi (@Musyimi97)
discussions-to: https://ethereum-magicians.org/t/erc-8329-subject-linked-impact-snapshot-log/28938
status: Review
status: Last Call
last-call-deadline: 2026-10-19
type: Standards Track
category: ERC
created: 2026-07-05
Expand All @@ -13,7 +14,8 @@ requires: 165

## Abstract

This ERC defines an append-only interface for reporting quantitative impact
This Ethereum Request for Comments (ERC) defines an append-only interface for
reporting quantitative impact
indicator snapshots against application-defined subjects. Each snapshot records
a signed value, decimal precision, unit, completed measurement period,
methodology commitment and location, reporter, recording time, and correction
Expand Down Expand Up @@ -111,6 +113,8 @@ is greater than the snapshot it corrects and therefore cannot be zero.
A compliant log MUST implement:

```solidity
pragma solidity ^0.8.20;

interface IImpactSnapshotLog {
struct IndicatorSnapshot {
bytes32 subjectId;
Expand Down Expand Up @@ -203,10 +207,10 @@ MUST handle the declared precision safely and MUST NOT assume the value is
nonnegative.

`unit` SHOULD be the `keccak256` hash of a documented canonical unit string.
Applications SHOULD use SI or Unified Code for Units of Measure
(UCUM)-compatible representations when available and MUST document exact case,
spelling, pluralization, and conversion rules for custom or zero-valued unit
identifiers.
Applications SHOULD use International System of Units (SI) or Unified Code for
Units of Measure (UCUM)-compatible representations when available and MUST
document exact case, spelling, pluralization, and conversion rules for custom
or zero-valued unit identifiers.

This ERC does not require a nonzero `subjectId`, `indicatorId`, or `unit`.
Applications requiring stricter namespaces MUST enforce and document them.
Expand Down Expand Up @@ -369,6 +373,8 @@ unit from `indicatorId` alone.
Attestation is OPTIONAL. An implementation supporting it MUST implement:

```solidity
pragma solidity ^0.8.20;

interface IImpactAttestation {
struct Attestation {
address attestor;
Expand Down Expand Up @@ -440,6 +446,8 @@ Methodology versioning is OPTIONAL. An implementation supporting it MUST
implement:

```solidity
pragma solidity ^0.8.20;

interface IMethodologyVersioning {
event MethodologySuperseded(
bytes32 indexed subjectId,
Expand Down Expand Up @@ -606,30 +614,6 @@ An attestor's changed view is itself relevant history. Appending the later
assessment preserves both statements and lets consumers apply their own
recency and credential policies.

### Prior Art

The Onchain Representation for Audits proposal defines on-chain audit-report
representation. This ERC defines quantitative, period-bounded indicator time
series with corrections and methodology lifecycle semantics.

The On-Chain Verifiable Credentials proposal defines on-chain verifiable
credentials. Credentials can support reporter or attestor authorization but do
not define this snapshot model.

Generic attestation systems can represent impact claims through custom schemas.
This ERC defines a dedicated storage and query interface for indicator periods,
correction chains, methodology transitions, and snapshot-specific assessment
histories.

Impact-certificate systems can represent broad claims, evaluations, or funding
relationships. This ERC is narrower: it standardizes subject-linked
quantitative snapshots and their lifecycle rather than ownership of an impact
claim.

Carbon-credit token systems represent issuance, transfer, and retirement of
specific environmental assets. This ERC does not tokenize credits or prevent a
reported measurement from being claimed elsewhere.

## Backwards Compatibility

This ERC introduces new interfaces and does not modify existing token,
Expand Down
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