Soil Carbon (Cool Farm Tool)

Overview

This DOVU methodology quantifies greenhouse gas emissions and soil carbon change on farms using the Cool Farm Tool, a greenhouse gas calculator for agriculture. It is implemented as a policy on the Hedera Guardian platform, where farm data and measurement, reporting, and verification data are submitted and signed off by an independent verifier before a token is minted. DOVU aligns the process with the IWA Voluntary Ecological Markets specification. Each issued credit is a fungible, divisible token that represents carbon dioxide equivalent reduced or removed.

Sources: methodology document · DOVU

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": "DOVU-CFT",
  "name": "Soil Carbon (Cool Farm Tool)",
  "registry": "DOVU (DOVU)",
  "sector": "Soil carbon",
  "creditType": "removal",
  "status": "testing",
  "version": "1.0",
  "roles": [
    {
      "id": "registry",
      "name": "Standard Registry",
      "permission": "Owns the policy, approves participants, anchors each issuance to its evidence."
    },
    {
      "id": "proponent",
      "name": "Project Proponent",
      "permission": "Registers the project and submits monitoring reports."
    },
    {
      "id": "vvb",
      "name": "Validation & Verification Body",
      "permission": "Independently validates the design and verifies monitored data."
    }
  ],
  "schemas": [
    "at://did:plc:bl0adl1sten1ngp0l1cyreg/org.broadlistening.policy.schema/dovu-coolfarm-project-design",
    "at://did:plc:bl0adl1sten1ngp0l1cyreg/org.broadlistening.policy.schema/dovu-coolfarm-monitoring-report"
  ],
  "graph": "at://did:plc:bl0adl1sten1ngp0l1cyreg/org.broadlistening.policy.graph/dovu-coolfarm",
  "issuesAs": "org.hypercerts.claim.activity",
  "workScope": "at://did:plc:bl0adl1sten1ngp0l1cyreg/org.hypercerts.workscope.cel/dovu-coolfarm-scope",
  "rights": "at://did:plc:bl0adl1sten1ngp0l1cyreg/org.hypercerts.claim.rights/dovu-coolfarm-rights",
  "createdAt": "2025-01-01T00:00:00.000Z"
}

04 · Schemas

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