OpenChainGraph Suite · CONTRACT A3 · arch #5

50%-Rule Ownership Screening

Note (dated 2026-08-04): a chain composes independent computations performed in an analytical order. No step's output is carried into the next step by the execution model; each step computes from its own declared inputs. This is true of every chain on this site, including chains whose per-step copy below reads as a data handoff.

W-A flagship. OFAC/EU/BIS 50%-rule aggregate-ownership traversal over a synthetic ownership graph (ART-91) -> sanctions list-coverage conformance (ART-92) -> audit receipt (cry-05). Determines constructively-blocked entities per BIS Affiliates Rule (29 Sep 2025) and OFAC 50% rule. Synthetic entities only.

OpenChainGraph · 3 Steps cryptographic mandate Hash-Anchored §4 chain_depth:3 Client-Side · Zero PII
Chain Topology — Ownership 50%-Rule Aggregator → Screening List-Coverage Checker → Agent-Action Audit-Trail Aggregator
§4 Execution Hash · Chain Definition Anchor
execution_hash:computing…
Chain Stages · 3 Steps
1 ROOT · D0 node
Ownership 50%-Rule Aggregator art-91-ownership-50pct-aggregator
blocked-entity verdicts (H1) feed the coverage checker
MCP Call · aggregate_ownership_50pct
{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "aggregate_ownership_50pct",
    "arguments": {}
  },
  "id": 1
}
https://mcp.ainumbers.co/mcp
↓
2 D2 node
Screening List-Coverage Checker art-92-screening-list-coverage-checker
coverage conformance (H2) feeds the aggregator
MCP Call · check_screening_list_coverage
{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "check_screening_list_coverage",
    "arguments": {}
  },
  "id": 1
}
https://mcp.ainumbers.co/mcp
↓
3 TERMINAL · D3 node
Agent-Action Audit-Trail Aggregator cry-05-agent-action-audit-trail-aggregator
Exports composite ownership-screening artifact with execution_hash (H3), final stage
MCP Call · aggregate_execution_receipts
{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "aggregate_execution_receipts",
    "arguments": {}
  },
  "id": 1
}
https://mcp.ainumbers.co/mcp
Export Artifacts
Download the §4 chain definition artifact (hash-anchored composite JSON) or the §13.11 W3C Verifiable Credentials view. Both derive from the chain definition — no new hash is minted. Available after hash computation.

Ask your agent

Copy this paragraph into Claude, OpenClaw, or any MCP-aware agent to run this whole workflow on the server and check one field that answers a real question.

Question: A listed parent holds 60 percent of a holdco which owns our counterparty. Is the counterparty constructively blocked?
Run the AINumbers MCP tool `run_chain` with {"chain":"sanctions-ownership"} and read `art-91-ownership-50pct-aggregator.blocked_count`.
Re-run with `inputs` for `art-91-ownership-50pct-aggregator`, reusing the values that result echoed, with `ownership_graph` changed so one OFAC-listed parent holding 60 percent of a holdco. Compare the same field.
Verify: call `verify_execution_hash` (https://mcp.ainumbers.co/mcp) with `claimed_hash` set to `composite_execution_hash` and the full `composite_artifact`.
Ledger, for a human re-check: https://ledger.ainumbers.co/
PII rule: send synthetic or anonymised inputs only. The MCP server runs these kernels and logs no payloads.
Chain page: https://ainumbers.co/chaingraph/chains/sanctions-ownership.html