A tool for saving data records on the Base blockchain, a network built on Ethereum, with checks that can prove the records were not changed.

Store public or private agent data, read entries, verify their signatures, create audit trails, and grant access to private records.

It creates a lasting record of data fingerprints and audit history, while allowing access rules for private entries.

ercdata — Skill for Claude Code and Codex by Demerzels-lab

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add Demerzels-lab/elsamultiskillagent --skill ercdata

Clone the repo

git clone --depth 1 https://github.com/Demerzels-lab/elsamultiskillagent

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/demerzels-lab/elsamultiskillagent/ercdata.svg)](https://agentmods.dev/skills/demerzels-lab/elsamultiskillagent/ercdata)

Your own site

<a href="https://agentmods.dev/skills/demerzels-lab/elsamultiskillagent/ercdata"><img src="https://agentmods.dev/badge/skills/demerzels-lab/elsamultiskillagent/ercdata.svg" alt="Measured on agentmods" height="20"></a>

Per session 79 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 875 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00079	$0.00875
Opus 5	$0.00039	$0.00438
Sonnet 5	$0.00016	$0.00175
Haiku 4.5	$0.00008	$0.00088

Measured 8d ago against content hash 599e14e6bba8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

ercdata scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/ercdata-cli.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

public/skills/0xreisearch/ercdata/SKILL.md · 84 lines

How it starts

The opening of the file, as written. The whole thing — 84 lines — stays where its author put it; the contents beside it link to each section on GitHub.

ERCData

Store and verify AI-related data on Base mainnet. Public or private, with cryptographic integrity proofs.

Quick Start

# Store public data
uv run {baseDir}/scripts/ercdata-cli.py store \
  --type AI_AGENT_MEMORY \
  --data "memory hash: abc123" \
  --metadata '{"agent":"MyBot","ts":"2026-01-31"}' \
  --key $ERCDATA_KEY --contract $ERCDATA_CONTRACT

# Store private data (only you + granted addresses can read)
uv run {baseDir}/scripts/ercdata-cli.py store \
  --type AI_AGENT_MEMORY \
  --data "secret memory data" \
  --private \
  --key $ERCDATA_KEY --contract $ERCDATA_CONTRACT

# Read entry
uv run {baseDir}/scripts/ercdata-cli.py read --id 1 --key $ERCDATA_KEY --contract $ERCDATA_CONTRACT

# Verify entry (EIP-712 signature check)
uv run {baseDir}/scripts/ercdata-cli.py verify --id 1 --method eip712 --key $ERCDATA_KEY --contract $ERCDATA_CONTRACT

# Grant access to private entry
uv run {baseDir}/scripts/ercdata-cli.py grant-access --id 2 --to 0xSomeAddress --key $ERCDATA_KEY --contract $ERCDATA_CONTRACT

Configuration

Set via environment or skill config:

ERCDATA_KEY — Private key for signing transactions (required for writes)
ERCDATA_CONTRACT — Contract address on Base mainnet
ERCDATA_RPC — RPC URL (default: https://mainnet.base.org)

Or pass via --key, --contract, --rpc flags.

Commands

Command	What it does
`store`	Store data on-chain (add `--private` for access control)
`read`	Read a data entry by ID
`verify`	Verify data integrity (eip712 or hash method)
`grant-access`	Grant read access to an address (private entries)
`revoke-access`	Revoke read access
`register-type`	Register a new data type (admin only)
`snapshot`	Create a point-in-time snapshot
`info`	Get entry info without full data

Privacy Model

Public (default): Anyone can read via getData(). Use for transparency, audit trails.
Private (--private): Only the provider, granted addresses, and admin can read. Use for sensitive agent data.

Read the full file on GitHub · 84 lines

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

8d ago First seen · 84 lines · 79 tokens per session scan A 599e14e6bba8

Subscribe to this mod's changes

ercdata is a skill published in the GitHub repository Demerzels-lab/elsamultiskillagent (10 stars, last pushed 3mo ago), licensed MIT. It adds 79 tokens to every session and 875 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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