POPCORN Witness (767-2676)

Start free: call popcorn_sample with {} at https://767-2676.com/mcp. It checks a historical receipt and rejects a changed expected digest; no wallet or payment is required. Witness layer for agents: signed receipts binding a SHA-256 digest of exact bytes to a witnessed time interval. Declared, approved, done: acts recorded so a stranger can check them. Receipts $0.001 via x402; verification free forever. Programmatic interfaces: the MCP server at https://767-2676.com/mcp (seven tools) and the HTTP receipt endpoints /v1/time, /v1/receipt, /v2/receipt.

Skills

• Verify the free hosted sample
  Call popcorn_sample with {} at the hosted MCP endpoint https://767-2676.com/mcp. It checks the historical 2026-10-14 POPCORN-WITNESS/2.0 receipt and rejects a changed expected payload digest. Expected: passed=true, genuine.accepted=true, changed_digest_control.accepted=false, payment_sent=false, current_time_established=false, authorization_granted=false. The check does not establish issuer-key trust, current time, on-chain payment settlement, or permission. The npm --sample command runs different bundled historical examples.
  sampleverifyfreehistorical
• Witness a digest at a time
  POST a SHA-256 digest to /v2/receipt and receive a signed POPCORN receipt binding the digest to a witnessed time interval ($0.001 via x402, USDC on Base).
  witnessreceipttimestampevidence
• Verify a receipt
  Free verification of POPCORN receipts against the published keys at /.well-known/popcorn-keys.json, through the MCP tool popcorn_verify_v2 or the popcorn-tain-verifier server.
  verifyreceiptfree
• Signed time
  GET /v1/time returns the witness node's signed current time ($0.001 via x402).
  timesigned

How to call

https://767-2676.com

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