Biodiversity Gain (basket of metrics)

Overview

The Wallacea Trust methodology quantifies biodiversity change on project sites from restoration or protection interventions and translates it into biodiversity credits. Biodiversity is assessed by monitoring a basket of at least five predefined metrics chosen to reflect the conservation objectives for each site, habitat, and ecoregion. One biodiversity credit is defined as a 1 percent uplift, or avoided loss, per hectare in the median value of that basket of metrics. The approach is designed to apply across habitats and ecoregions worldwide.

Sources: methodology document · Wallacea Trust

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, including where the Darwin Core occurrence + measurement records feed in. 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. The ◈ dwc.occurrence and ◈ dwc.measurement tabs are the Darwin Core field evidence the monitoring node writes; see the section below.

{
  "$type": "org.broadlistening.policy.methodology",
  "code": "Wallacea BCM",
  "name": "Biodiversity Gain (basket of metrics)",
  "registry": "Wallacea Trust (WT)",
  "sector": "Biodiversity",
  "creditType": "biodiversity",
  "status": "active",
  "version": "3.0",
  "scopes": [
    "Biodiversity",
    "All ecoregions"
  ],
  "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/wallacea-bcm-bio-baseline",
    "at://did:plc:bl0adl1sten1ngp0l1cyreg/org.broadlistening.policy.schema/wallacea-bcm-bio-monitoring"
  ],
  "graph": "at://did:plc:bl0adl1sten1ngp0l1cyreg/org.broadlistening.policy.graph/wallacea-bcm",
  "issuesAs": "org.hypercerts.claim.activity",
  "workScope": "at://did:plc:bl0adl1sten1ngp0l1cyreg/org.hypercerts.workscope.cel/wallacea-bcm-scope",
  "rights": "at://did:plc:bl0adl1sten1ngp0l1cyreg/org.hypercerts.claim.rights/wallacea-bcm-rights",
  "createdAt": "2025-01-01T00:00:00.000Z"
}

04 · Schemas