Prove what your AI agents actually did.

import { createSequesign } from "@sequesign/sdk";

const sdk = createSequesign({
  witness: {
    baseUrl: "https://witness.sequesign.com",
    apiKey: process.env.SEQUESIGN_API_KEY
  }
});

const session = await sdk.startSession({
  agent: { agentId: "agent_acme_invoice_bot", keypair: agentKeys },
  task:  { taskId: "inv_2024_07_421", profile: "invoice-payment-v1" }
});

await session.recordAction({
  actionType: "invoice_reviewed",
  evidence:   { invoice_id: "inv_2024_07_421", decision: "approve" }
});

const { receiptPath } = await session.finalize();
// receiptPath → ./out/<task_id>.tar.gz  ·  verifiable offline

# Witness one action over bare HTTP. The same operation as SDK (direct).
# action_record_hash and the chain states are precomputed from the action
# record; docs/protocol-primitives-reference.md shows how.
curl -s -X POST https://witness.sequesign.com/witness \
  -H "Authorization: Bearer $SEQUESIGN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "chain_id": "chn_minimal_action",
    "sequence": 1,
    "action_record_hash": "de15a7e8f5a7e310bc899451bce16bcddb2c709d45f62a16f1bce6c17f2ac85d",
    "previous_chain_state": "7a94dc75d14c5fb6af6d27a931534b5e034c1e8e5d51b4ae2b7b027aa53651d7",
    "chain_state": "e5f14487d84857e74a2025d8739c1425f8ec9fe7dccf7d8703f61f7bc1277ea0"
  }'
# Records the action and returns a witness attestation.

import { createSequesign } from "@sequesign/sdk";

// Managed mode routes through Sequesign's hosted broker. Sequesign
// stores and witnesses the receipt; nothing is written to local disk.
const sdk = createSequesign({
  mode: "managed",
  tier: "hosted",
  broker: {
    baseUrl: "https://broker.sequesign.com",
    apiKey: process.env.SEQUESIGN_API_KEY
  }
});

const session = await sdk.startSession({
  agent: { agentId: "agent_acme_invoice_bot", keypair: agentKeys },
  task:  { taskId: "inv_2024_07_421", delegatorId: "acme_ap_team" }
});

await session.recordAction({
  actionType: "invoice_reviewed",
  evidence:   { invoice_id: "inv_2024_07_421", decision: "approve" }
});

const { receiptId, receiptUrl } = await session.finalize();
// receiptUrl → dashboard.sequesign.com/receipts  ·  witnessed and stored
// To verify offline later, check witness signatures against the discovery
// key (/.well-known/sequesign/keys.json), not any key in the response.
// In bare HTTP this flow needs client-side Ed25519 signing and envelope
// assembly; the Python and Go examples in
// docs/protocol-primitives-reference.md section 5 show the machinery.

# Python SDK coming soon.
# Track progress on GitHub: https://github.com/Sequesign/sdk

// Go SDK coming soon.
// Track progress on GitHub: https://github.com/Sequesign/sdk

# Claude Code — add the server. Direct mode signs
# locally but the hosted witness needs a write-class
# API key from dashboard.sequesign.com.
claude mcp add sequesign \
  --env SEQUESIGN_API_KEY=sq_live_... \
  -- npx -y @sequesign/mcp

# Leaving the agent key unset mints a per-session key
# (self-asserted). If your API key is registered to an
# agent key, also pass that exact key:
#   --env SEQUESIGN_AGENT_PRIVATE_KEY="$(cat agent.key.pem)"

# Claude Desktop — one-click Desktop Extension:
# download sequesign.mcpb from the GitHub release,
# or find Sequesign in the MCP registry.

# Then just ask your agent:
"Review and pay invoice INV-4242 ($4,200) from Acme
Supplies — then give me a Sequesign receipt I can
verify independently."

# The agent opens a signed session, records each step,
# and seals a witnessed receipt that verifies offline.