OpenChainGraph Suite · ART-269 · Sanctions & KYC

W-8 Series Structural Validation

Validates W-8 series form structural consistency: form-type/Ch.3 status compatibility, Ch.3/Ch.4 FATCA status cross-check, 3-year validity window per Treas. Reg. §1.1441-1(e)(4)(ii), and treaty dividend rate verification against IRS Pub 901. Structural checks only — no TIN, no name, no address. ZERO PII.

Sanctions & KYC IRS W-8 Series Ch.3 Withholding FATCA Ch.4 IRS Pub 901 Proofs Deferred
🔒 All inputs are processed locally in your browser. No data is transmitted. This tool accepts form-type codes, Ch.3/Ch.4 status codes, treaty country codes, and dates only. NEVER enter real TIN, EIN, SSN, name, address, or beneficial-owner identity data.
Form Identity
Leave blank for W-8BEN (individual). Required for W-8BEN-E.
Treaty Claim
2-letter ISO country. Leave blank if no treaty claim. E.g. GB, CA, DE, JP, AU.
Claimed treaty rate for dividends. Leave blank if no treaty claim.
Validity Dates
Validity Details
Execution Hash (SHA-256)

  







  

    
Ask your agent

    
  

  
Copy this paragraph into Claude, OpenClaw, or any MCP-aware agent to run this exact tool, with this sample, and verify the artifact.

  
Run the AINumbers MCP tool `validate_w8_series_structural`. Task: Validate W-8 series form structural consistency for withholding tax compliance.
Call it with arguments: {"policy_parameters":{"form_type":"W-8BEN","chapter3_status":"Individual","chapter4_fatca_status":"","treaty_country":"GB","treaty_rate_pct":15,"income_type":"Dividend","form_date":"2024-03-15","reference_date":"2025-07-05"}}
Verify before trusting: call `verify_execution_hash` on mcp.ainumbers.co (https://mcp.ainumbers.co/mcp) with the parameter `claimed_hash` set to the returned `execution_hash`, passing the full artifact the run returned (the object containing `policy_parameters` + `output_payload` + `execution_hash`; equivalently `policy_parameters` + `output_payload` with `claimed_hash`), not the bare hash string.
Return the ledger link https://ledger.ainumbers.co/ so a human can re-verify without contacting us.
PII rule: All inputs are processed locally in your browser. No data is transmitted. Do not enter real personal data — use synthetic or anonymised inputs only.
Open the tool with the sample prefilled: https://ainumbers.co/chaingraph/art-269-validate-w8-series-structural.html#p=v1.H4sIAAAAAAAA_wHLADT_eyJmb3JtX3R5cGUiOiJXLThCRU4iLCJjaGFwdGVyM19zdGF0dXMiOiJJbmRpdmlkdWFsIiwiY2hhcHRlcjRfZmF0Y2Ffc3RhdHVzIjoiIiwidHJlYXR5X2NvdW50cnkiOiJHQiIsInRyZWF0eV9yYXRlX3BjdCI6MTUsImluY29tZV90eXBlIjoiRGl2aWRlbmQiLCJmb3JtX2RhdGUiOiIyMDI0LTAzLTE1IiwicmVmZXJlbmNlX2RhdGUiOiIyMDI1LTA3LTA1In2i__twywAAAA