# A Sheaf of Attestations


Batch settlement attestations, one signed receipt per transaction.

## At a glance

- **Attests:** Two to twenty signed JSON observations, one per Base transaction hash supplied, each carrying the same fields and independent signature as the single settlement attestation — plus a certificate binding a sha256 digest of the sheaf's evidence hashes, so one verify URL answers for all of them. Instant.
- **Input:** tx_hashes (query parameters; input schema and checkout: https://scvd.store/menu/attestation_bundle?view=compact)
- **Output:** Two to twenty signed JSON observations, one per Base transaction hash supplied, each carrying the same fields and independent signature as the single settlement attestation — plus a certificate binding a sha256 digest of the sheaf's evidence hashes, so one verify URL answers for all of them. Instant. Every artifact carries a cert_id and verifies free at https://scvd.store/api/verify/{cert_id}.
- **Cryptography:** ed25519 signature by this store's key, published at https://scvd.store/.well-known/scvd-signing-key and carried inside every 402
- **Verify:** GET https://scvd.store/api/verify/{cert_id} — free, no account, no rate limit, checkable offline with the published key
- **Price and fulfilment:** $0.05 USDC fixed, one-off; nothing here charges again by itself, ever — there is no mechanism that could; delivered instantly
- **Does not attest:** fitness for your particular task; future protocol compatibility beyond stated interfaces; human-labor turnaround faster than posted SLA

## About this item

Up to 20 settlement attestations in one purchase. Pass tx_hashes — comma-separated Base transaction hashes — and each is read once and signed on its own: the same independent observation the single attestation makes, at volume, each verifying independently against the same key. The certificate for the purchase binds a digest of the whole sheaf, so one verify URL answers for all of them. Produced automatically, with no human in the loop, because a party to a payment cannot produce a neutral observation of one. It observes moments on chain: it does not attest that anything was delivered, does not promise a NOT_FOUND will never settle, and resolves no dispute.

- **id:** `attestation_bundle`
- **price:** $0.05 fixed, one-off; nothing here charges again by itself, ever — there is no mechanism that could
- **fulfillment:** delivered instantly
- **buy:** `GET https://scvd.store/api/buy/attestation_bundle?tx_hashes=<tx_hashes>` (USDC over x402 v2 on Base, Polygon, Arbitrum, World, Solana, Arc (Circle Gateway), or USDC over MPP (evm/charge) on Base for every shelf item, every publication page and the commission desk)
- **required inputs:** `tx_hashes` — fill the `<tx_hashes>` slot above before paying. The bare door `GET https://scvd.store/api/buy/attestation_bundle` quotes free and refuses the paid request without it; no money moves.
- **sample:** https://scvd.store/samples/attestation-bundle.json

House rules: give 2 to 20 base transaction hashes in the tx_hashes query parameter, comma-separated, no duplicates; each hash is observed once and signed on its own; the bundle is a purchase shape, not a different artifact; observes settlement only, never delivery; one read per hash at one moment; no polling, no retry, no second look; per-hash narrowing (payer, recipient, nonce, amount) is the single attestation's feature; the sheaf takes hashes only.

> A nickel for the sheaf. Each receipt signed on its own, every one built to hold in a room where nobody trusts you.