Carbon Emission Tokens & Removal Units

Overview

This is a digital implementation of the GHG Protocol Corporate Standard, including the Scope 2 Guidance, delivered as a policy on the Hedera Guardian platform. It calculates an organization's greenhouse gas emissions from sources such as grid electricity, using location-based and market-based methods, natural gas, mobile combustion, and refrigerants, based on measurement, reporting, and verification data that can be entered manually or transmitted by devices such as IoT-enabled meters. The policy applies standard emission factors and IPCC global warming potentials and then tokenizes the results. One Carbon Emission Token represents one metric ton of carbon dioxide equivalent of emissions.

Sources: methodology document · Greenhouse Gas Protocol

01 · Roles

The workflow as an explicit directed graph. In Graph each column is one role, so you can see who acts at each step; every node names the org.broadlistening.policy.block.* def it resolves to plus its input and output record. Data flow switches to a lineage view that makes explicit what data each node needs and makes, with dependency arcs tracing every record back to the node that produced it. Hover to trace, click to inspect; revise edges (dashed) send work back.

03 · Generated lexicon records

The records this methodology compiles to, ready to write to a PDS. The first tabs are the new policy engine records; the ★ claim.activity tab and those after it are reused ATProto Collective Funding Ecosystem records (org.hypercerts.*): the issued hypercert batch, its rights, an example verification attachment and a retirement receipt.

{
  "$type": "org.broadlistening.policy.methodology",
  "code": "CET-CRU",
  "name": "Carbon Emission Tokens & Removal Units",
  "registry": "Greenhouse Gas Protocol (GHG)",
  "sector": "Tokenised inventory",
  "creditType": "inventory",
  "status": "testing",
  "version": "1.0",
  "roles": [
    {
      "id": "registry",
      "name": "Programme Administrator",
      "permission": "Owns the protocol and approves reporters."
    },
    {
      "id": "reporter",
      "name": "Reporting Entity",
      "permission": "Defines the inventory boundary and reports activity data."
    },
    {
      "id": "verifier",
      "name": "Verification Body",
      "permission": "Provides limited or reasonable assurance over the inventory."
    }
  ],
  "schemas": [
    "at://did:plc:bl0adl1sten1ngp0l1cyreg/org.broadlistening.policy.schema/cet-cru-inventory-boundary",
    "at://did:plc:bl0adl1sten1ngp0l1cyreg/org.broadlistening.policy.schema/cet-cru-activity-data"
  ],
  "graph": "at://did:plc:bl0adl1sten1ngp0l1cyreg/org.broadlistening.policy.graph/cet-cru",
  "issuesAs": "org.hypercerts.claim.activity",
  "workScope": "at://did:plc:bl0adl1sten1ngp0l1cyreg/org.hypercerts.workscope.cel/cet-cru-scope",
  "rights": "at://did:plc:bl0adl1sten1ngp0l1cyreg/org.hypercerts.claim.rights/cet-cru-rights",
  "createdAt": "2025-01-01T00:00:00.000Z"
}

04 · Schemas

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