Cryptographically verifiable

Receipt I7K2C5W

Mathew P. referred Felix M. to CoSai CFO Services.

Verification result
Receipt I7K2C5W · rh_i7k2c5w_89345_d…e1b4d7f0
Verdict
✓ Chain integrity verified
This receipt's 4-event chain has been cryptographically verified. Each event signature, the hash chain linking events, and the independent monthly witness records all check out.
Handshake completeness
80%
Events on chain
4
ZK witness proofs
1
Anchored blocks
4

What this receipt proves

ReferrerMathew P.
RefereeFelix M.
Vertical Financial Planning
PartnerCoSai CFO Services
Intent signed22 Apr 2026, 02:30 pm
Receipt statusSETTLED
Commission amount$56.00

Causation chain (4 of 5 core handshakes)

1
Referrer intent signed
22 Apr 2026, 02:30 pm
"Hey, I referred you"
Biometric-bound Independently witnessed · period #5 Hash chain OK
signed by Mathew P.
device Mathew's MacBook Pro (Touch ID) · WebAuthn
sig (ES256) sig_es256_intent_i7k2c5w
event hash eh_intent_i7k2c5w_a7b9c1d3…b7c9d1e3f5
prev hash (genesis of this receipt)
block merkle root mr_89102_e5f6a7b8c9d0e1f2a…e9f0a1b2c3
2
Referee acknowledged
22 Apr 2026, 02:39 pm
"Yes, I got that referral"
Biometric-bound Independently witnessed · period #5 Hash chain OK
signed by Felix M.
device Felix's iPhone · iOS Secure Enclave
sig (ES256) sig_es256_ack_i7k2c5w_felix
event hash eh_ack_i7k2c5w_b8c0d2e4f6a…c8d0e2f4a6
prev hash eh_intent_i7k2c5w_a7b9c1d3…b7c9d1e3f5
block merkle root mr_89102_e5f6a7b8c9d0e1f2a…e9f0a1b2c3
3a
Partner intake witnessed
25 Apr 2026, 01:45 pm
"Partner confirmed lead in"
Biometric-bound Independently witnessed · period #5 Hash chain OK
signed by Carla O. (CoSai CFO Services)
device Carla Oliver (CoSai) · WebAuthn
sig (ES256) sig_es256_intake_i7k2c5w_carla_cosai
event hash eh_intake_i7k2c5w_c9d1e3f5…d9e1f3a5b7
prev hash eh_ack_i7k2c5w_b8c0d2e4f6a…c8d0e2f4a6
block merkle root mr_89102_e5f6a7b8c9d0e1f2a…e9f0a1b2c3
3c
Partner settlement witnessed
08 May 2026, 08:13 am
"Yes, that referral converted"
Biometric-bound Independently witnessed · period #6 Hash chain OK
signed by Carla O. (CoSai CFO Services)
device Carla Oliver (CoSai) · WebAuthn
sig (ES256) sig_es256_settle_i7k2c5w_c…ai_witness
event hash eh_settle_i7k2c5w_d0e2f4a6…e0f2a4b6c8
prev hash eh_intake_i7k2c5w_c9d1e3f5…d9e1f3a5b7
block merkle root mr_89345_f6a7b8c9d0e1f2a3b…f0a1b2c3d4
4
Referee confirmed outcome Awaiting
"Yes, Mathew deserves their commission"

Zero-knowledge witness proofs

The partner's witness agent emits cryptographic proofs that the deal happened — without exposing customer PII or exact dollar amounts. Auditors can verify these proofs offline.

Deal settled Verified offline
proof algorithm GROTH16 (zero-knowledge)
witness agent WA-COSAI-001 v1.4.2
partner CoSai CFO Services
declared value bucket $1,100.00 – $1,300.00 (exact value never revealed)
product category ACCT_TAX_RETURN
asserted status ACTIVE
settled on or before 08 May 2026
proof bytes zkproof_cosai_settle_i7k2c5w...

How to verify this offline (for auditors)

  1. Download the JSON: /api/receipts/I7K2C5W
  2. For each event, verify SHA-256(payload_json || prev_event_hash) === event_hash
  3. For each signature, verify ES256.verify(payload_json, signature, device_public_key)
  4. For the period seal, verify the block's merkle_root against the independent monthly witness records published at /chain (witness keys rotated quarterly)
  5. For ZK witness proofs, run the partner's witness-agent verifier with the published verifying key (Groth16 / PLONK / STARK)

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This is a Provable Attribution receipt. Every event below is timestamped, locked, and independently witnessed each month — so no one (including us) can rewrite history.

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