{"surface":"GSC Handshake","host":"gsc-handshake.ai","version":"1.0.0","operator":"GreenCore Solutions Corp.","duns":"24-336-6774","role":"practice page + guest book of the handshake; the ledger lives with the transaction surface","posture":"GSC verifies every counterparty card presented at task acceptance and publishes its practice; verification is graded, not gated.","doctrine":"Verification is not authorization. Identity answers “is it who it claims”; ACM execution answers “what may it do”. A VERIFIED counterparty can still draw ACM-403, ACM-300, or ACM-451 on the commercial action.","stand":"Machine verification narrows what humans decide; humans decide what machines commit.","declared":"2026-08-24","states":["VERIFIED","UNSIGNED","INVALID","KEY-UNREACHABLE"],"surfaces":{"practice":"https://gsc-handshake.ai/","decision_table":"https://gsc-handshake.ai/decision-table.json","guest_book":"https://gsc-handshake.ai/guest-book.json","attestation":"https://gsc-handshake.ai/attestation.json","ledger":"https://mcp.cpghumanintheloop.ai/handshake/ledger.json","keyring":"https://dpuone.ai/.well-known/jwks.json","resolver":"https://gsc-registry.ai/"},"invitation":{"line":"IA us.","url":"https://instantagentmessage.ai/"},"enforcement_posture":"open-by-declaration · migration: OAuth 2.1 + PKCE challenge (401 + WWW-Authenticate) on mcp:transact methods per MCP 2025-11-25 · trigger: ecosystem GA of credentialed counterparties · window: Q4 2026 - Q1 2027 · declared 2026-08-24"}