QuevraOpen queue
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Public by design.Yours to join.Yours to leave.

Take a public ticket. Cancel only your own. A small onchain queue, without an operator in the middle.

Open queue Read the paper
Self-service
You control entry
Public
Ticket history
No custody
Network gas only

Self-service entry

One active ticket.
Your wallet, your decision.

Personal control

Cancel your own ticket.
Keep the public history.

Enter deliberatelyKeep your ticket activeLeave when you choose
Explore below

A smaller way to coordinate

Join once.
Leave cleanly.

Some groups only need to know who took a number, and whether that ticket is still active. Quevra keeps that decision with its holder.

Take your own ticket

Joining issues the next number to your wallet. While it is active, the same wallet cannot take another.

Change your mind

Cancel the exact ticket you reviewed. A new visit can create a new number, without erasing the old one.

Explore the queue

The choice stays with you

One wallet.
One active ticket.

There is no operator account that can cancel it for you.

Readable, not overpromised

A number is not a rank.

The record makes participation inspectable. It does not decide who gets served, or promise when.

Issued sequence

Numbers keep moving.

Every join receives a new number. Cancelled numbers are never recycled.

totalIssued
Your active ticket

A personal state.

A wallet holds one current ticket, or none. Only that wallet can cancel it.

currentTicket
Active participation

A count, not a place.

The number of active tickets says nothing about the people ahead of you.

activeCount
No deposit.
No operator balance.

Less authority, fewer assumptions

Your ticket.
Not your funds.

The queue accepts no native-token payment and holds no deposits. A future onchain action requires only the network’s transaction gas.

  • No admin overrideThe contract has no owner, privileged cancellation or service operator.
  • No hidden promiseA ticket is not an admission pass, delivery commitment, verified identity or reward.
  • Nothing live by implicationThis Demo has no deployed contract or selected network. Wallet connection alone enables no write.

The Quevra whitepaper

Small contract.
Clear boundaries.

Understand the ticket lifecycle, the decisions the contract makes, and the ones it deliberately leaves outside.

Read the design
Quevra

Participation,
without
permission.

Product design & contract specification

Before you take a number

Keep the
meaning clear.

Does a ticket guarantee a place in a service?

No. It records a wallet’s self-declared participation. It does not call, rank, admit or serve anyone.

What happens if I leave and rejoin?

Your old ticket becomes inactive. Rejoining issues a larger number and leaves the old holder record intact.

Can someone else cancel my ticket?

No. Cancellation checks the caller’s current ticket and the exact reviewed number. There is no administrator cancellation path.

Can one person use multiple wallets?

Yes. The contract limits active tickets per wallet, not per person. It does not verify identity or prevent multiple-wallet participation.

Is the queue live on a blockchain?

Not yet. This is a local Demo. The separate queue page offers a memory-only exercise; onchain reads and writes remain disabled.

A public number. A personal choice.

Take a number.
Keep the choice.

Try the local queue, with no wallet and no transaction.

Explore the queue