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Harness tax: what checking a proof saves against redoing the work
Checking a finished result through its receipt took 3.7 ms and no model tokens; redoing the job took 2.79 s and 2,426 tokens. A handoff with a receipt cost $0.024 per correct outcome against $0.078 redoing the work and caught 3 of 3 tampered handoffs. Reading typed memory used 11.1 times fewer tokens than searching every record. Each figure is one run; the dates and records are in this receipt.
Check a receipt
Handoff
Memory tokens
Proofable harness-tax suite (receipt reuse timing, handoff-v1, vault typed-state head-to-head, verification-reuse model)
receipt-reuse 2026-10-17 at production 8100646c4; handoff-v1 2026-10-14 (k=1, three tasks); vault head-to-head 2026-11-09 at production a4264251d (k=1); identity-reuse model from published list prices 2026-10-14
z-ai/glm-5.3-flash (vault head-to-head, both arms); the reuse timing uses no model
Proofable receipt reuse, handoff and typed-memory measurements (methods described on https://docs.proofable.me/benchmark)
3.7 ms and 0 tokens to check a receipt against 2.79 s and 2,426 tokens to redo the job, about 750x
$0.024 with the receipt against $0.078 redoing the work; 3 of 3 tampered handoffs caught, 0 of 3 when trusting the forwarded text (k=1, three tasks; a sample, never a rate)
43,169 tokens in 66 s against 479,623 in 178 s searching record bodies (11.1x fewer, 2.7x faster) on a 3,621-record vault, summed over the two questions both arms answered correctly (k=1)
11.8x to 12.7x lower across Claude Sonnet 5.5, Gemini 3.1 Pro and GPT-6 Astra at list prices
$1.75 for 100 apps reusing one Stripe Identity check against $150.00 re-running it: a pricing model from published list prices, not a run
proof tagged bench:receipt-reuse on the Proofable founder profile (run 2026-10-17)
proof bench:vault-h2h 0x341716fb4d896d230dd567baf549a758fc42ca491b03ef0cc4f63368ee7f70f7 (run 2026-11-09)
Every figure is the current value in the claim register on 2026-11-10. The earlier typed-memory figure (42.4x fewer tokens, 8.8x faster, 2026-10-14) was superseded by the 2026-11-09 run and is not quoted.