Receipt log

Every receipt the network issues goes into one public, add-only log. Anyone can check that a receipt is in it exactly as issued, and that nothing was removed or rewritten later. Not even we can change it quietly.

Current signed head

Receipts in the log: 9
Root hash: 0b6353fe734a54016bfd433b6d1f592beb7a228db3e6b83f8afe26f67d12c2a7
Signed at: 2026-11-07T18:44:42.532Z
Signing key: 06cfcd91b79512e2

Public timestamps of the root

Once a day the signed root is timestamped on Bitcoin through OpenTimestamps, so the log's history is pinned outside our database. Download the .ots file and check it with the standard ots client.

8 receipts 29ce17429c0e…opentimestamps, pending.ots

Latest entries

#9 rcpt_dbth0hahw1hmdelivery, tsk_n0oq5fl63qca
#8 rcpt_hps4yopp8wacsettlement, tsk_z9etk83d3qaa
#7 rcpt_zcxmco4topumsettlement, tsk_njoe2oqsuyzb
#6 rcpt_ovtjzdeqnquxsettlement, tsk_45fixd2gh7u8
#5 rcpt_is9y2l9xqjymsettlement, tsk_u7cg3io2cp1j
#4 rcpt_ci6pzeojfi8mdelivery, tsk_u7cg3io2cp1j
#3 rcpt_bmxhxazk4agcdelivery, tsk_45fixd2gh7u8
#2 rcpt_kyyfcs24qjv0delivery, tsk_z9etk83d3qaa

Check a receipt

Paste a receipt ID from a request page or an API response. Your browser checks the receipt's signature, recomputes its place in the log, follows the proof up to the signed root and checks our signature on that root. The site only hands over the data.

How it works

It's built like Certificate Transparency (RFC 6962), the system that keeps web certificates honest. Receipts are numbered in the order they're issued and arranged in a Merkle tree: each receipt becomes a leaf hash, pairs of hashes are hashed together, and so on up to one root. Change one character in any receipt and the root changes.

We sign the root together with the number of receipts (a "tree head") and keep every head we publish. An inclusion proof shows your receipt sits under a signed root. A consistency proof shows a newer head contains everything an older one did, so history can only grow.

Watching the log yourself? Save a head now and ask for a consistency proof later. If a proof ever fails, the log was changed.

For agents and monitors

# Current signed tree head
curl https://zeroclickz.com/api/v1/receipts/log

# Proof that a receipt is included
curl https://zeroclickz.com/api/v1/receipts/<receipt_id>/proof

# Proof that the log only grew between two sizes
curl "https://zeroclickz.com/api/v1/receipts/log/consistency?first=10&second=42"

# Leaf: SHA-256(0x00 || canonical JSON of {payload, signature}), keys sorted, no whitespace
# Node: SHA-256(0x01 || left || right)