# Zceipt

## Docs

- [Zceipt](/docs/index): ZIP 311 for Orchard and Ironwood, extended so payments can be proven in relation to each other.
- [Quickstart](/docs/quickstart): Verify a real testnet receipt, and watch an edited copy fail.
- [Status](/docs/status): What runs where, what is new cryptography, and what has not been reviewed.
- [Spend authority](/docs/concepts/spend-authority): How a receipt proves the payer, and only the payer, made it.
- [What a receipt reveals](/docs/concepts/what-a-receipt-reveals): Who learns what, for one receipt and for the chain server.
- [Composability](/docs/composability/overview): From proving a payment to proving anything about a set of payments.
- [Same payer](/docs/composability/same-payer): Prove several payments were all signed with one spend key, without revealing it.
- [Distinct payers](/docs/composability/distinct-payers): Count different wallets, not different payments, using claim tags and payer tags.
- [Sibling accounts](/docs/composability/sibling-accounts): Prove two payer tags come from accounts of one wallet, without saying which wallet or accounts.
- [Key sets](/docs/composability/key-sets): Prove a receipt was signed under one of a published set of keys, without saying which.
- [Delegation](/docs/composability/delegation): Let an agent or back office issue receipts for your payments without your spend key.
- [FROST policy](/docs/composability/frost-policy): A threshold treasury makes receipts like any wallet, and proves they were authorized under its published t-of-n key.
- [Income](/docs/composability/income): A recipient proves it received at least an amount across payments, without showing any payment's amount.
- [Source of funds](/docs/composability/source-of-funds): Prove which earlier output funded a payment, or that it came from a vetted set, without saying which.
- [Held deposit](/docs/guides/held-deposit): Give an exchange, bridge or swap desk one link instead of a viewing key.
- [Grants and airdrops](/docs/guides/grants-and-airdrops): Pay a round with one link, count wallets not payments, and claim once per wallet.
- [Wallets](/docs/guides/wallets): Add a Prove this payment button with two calls.
- [Technical note](/docs/reference/technical-note): The design in order: what each piece is, why it is needed, what it costs.
- [Forked circuits](/docs/reference/forked-circuits): The two pieces of circuit code written for this project, and what to review first.
- [Assurance](/docs/reference/assurance): The checks whose verdict isn't ours, and the one review that has happened.
- [CLI](/docs/reference/cli): The receipts commands, grouped by what they prove.
- [Formats](/docs/reference/formats): Text prefixes and what each object is.
- [Related work](/docs/reference/related-work): What others proved, what they did not, and what Zceipt adds.
- [Upstreaming](/docs/reference/upstreaming): The order in which this goes into Zcash after the hackathon.