=== YUMO YUMO PRICE EPOCH v1 === # # Yumo Yumo — open price ledger # Product prices read from real receipts, published permanently. # # Publisher : Yumo Yumo Inc · https://yumoyumo.com # Sealed by : 32T9x5xGz6uaHtPnRhUhqHgJyWshbDJas7RYahEJjMjE (Solana mainnet) # One memo per epoch, no other authority: # yumoyumo:price-epoch:v1:::: # # Each observation below is identity-free: no buyer, no wallet, no receipt # id, and no time — merchant, city, date and price only. Receipt leaves are # opaque hashes; a receipt sealed with a wallet can be proven its owner's by # signing with that wallet's key, and reveals nothing to anyone else. # # Verify (needs nothing but this file and the memo above): # 1. keccak256(this file) === in the memo # 2. leaf = keccak256(utf8(line)) — the line IS the preimage # node = keccak256(concat(sort([l,r]))) — 32-byte pairs, sorted # leaves sorted ascending; an odd node is carried up unchanged # 3. fold every price-obs:v1| line + every receipt leaf # → must equal MERKLE_ROOT below and the root in the memo # # The chain proves this data was not altered. It does not prove we read # each receipt correctly: observations are validated before publication, # and whatever fails is withheld rather than published. # # When we get one wrong after publishing it, we say so here rather than # quietly. A === WITHDRAWN === section, when present, lists observations from # earlier epochs that this epoch retracts: # price-withdrawn:v1||| # is keccak256 of the published line, so you can find it in that # epoch's manifest yourself. Apply epochs in order and drop what is withdrawn; # a corrected value, where one exists, is republished here as a normal # observation. Withdrawals fold into the root below, so a retraction is sealed # as firmly as the mistake was. # # Row : price-obs:v1|||| # |||||| # |||| # kind = product | category (category = loose produce, id is a category) # discounted = 1 if the price was on offer, else 0 # Recipe : https://arweave.net/eabxr24slHrMbnZWIaKL3QiL7oitneL7y5sBHzK6EXQ # Licence : CC0-1.0 · https://creativecommons.org/publicdomain/zero/1.0/ # Public domain. Take it, republish it, build on it. # Attribution appreciated, never required. # EPOCH | 90 WINDOW_START | 2026-10-12T21:00:14.736Z WINDOW_END | 2026-10-13T21:00:14.495Z MERKLE_ROOT | 4a6119bc951a2451b4b0c0b3a3c85da0e4d2333e461c67fd4deec2552ea2f7eb OBSERVATION_COUNT | 0 RECEIPT_COUNT | 5 CATALOG_HASH | e6f919b250390e5a2df5fdbec8c168b3efd6c972679dc2b97f76231984a895e5 === OBSERVATIONS === === RECEIPT_LEAVES === 28c39feccae18511aff3c5ec678cf0f9c390e81673bf6db0c3a643fbdb3d072d 55cfb0a9d69d19e20fc49fbaaa38045b07919e46cd3fdb0820316178bc14cd3d 5f3d3b8cb0bf1f3a294b58ba969bb6b1c3617e733a3606a95ca28aafc8eb23fa 61d1827609986a6eb3bfcb7dfba204c5e97e0e8461a411f80db58c00a5a4e36c 8c11510fb4212d40624635d045aeaf2e7a0caf0a8f8cec509186382abd4c6114