Orderbook
The orderbook is not a centralized service. It is a signed, replicated, peer-observed inventory. Makers publish signed limit orders into an Extro orderbook torrent; peers seed them; each wallet sorts the book locally. This page covers the signed-order shape and the publishing economics. The book serves peers and agents identically — see Peers & Agents (PA2AP).
How the book works
- •The orderbook is not a centralized service. It is a signed, replicated, peer-observed inventory.
- •Makers publish signed limit orders into an Extro orderbook torrent.
- •Peers seed order chunks after receiving their publication-fee share.
- •Each wallet locally sorts bids and asks by price; spread is local best ask minus best bid.
- •Market orders walk the locally observed book; the taker chooses which limit orders to fill.
- •The taker submits exact order requests to makers/referee as the chosen flow requires.
Signed limit order
| Field | Meaning |
|---|---|
order_id | Stable identifier; bound into every proof and receipt for the order. |
maker_pubkey + pgp_fingerprint | Maker identity; the referee verifies the PGP binding against Extro identity data before use. |
sell_asset / buy_asset | Asset classes for each leg; the pair must satisfy the pair policy. |
amount + price | Exact offered amount and limit price; market orders walk the locally observed book. |
rail constraints | Which rails/flows the maker accepts (e.g. ARK 2-of-2, RGB state transition). |
public_token_hash | Commitment that binds a future fill to this order without revealing bearer plaintext. |
expiry + nonce | Validity window and replay protection. |
signature | Maker signature over the canonical encoding; peers verify before seeding. |
The order is immutable once signed. Proofs and fills bind to its order_id and public_token_hash, never to bearer plaintext.
Publishing economics
0.1%
of order value to publish
10
active seeders (example)
0.01%
to each seeder in that example
Publishing an order requires paying the active seeders that replicate it. The fee is 0.1% of order value, split evenly across active seeders. Worked example: for an order worth 1.000 units, the total fee is 0.001 units (0.1%); with 10 active seeders each receives 0.0001 units (0.01%) each.
The order publication envelope must carry the fee receipts, or a signed failure reason if publication did not complete. Publication fees are payable in Webcash or Bitcoin ARK only.
Bootstrap
Bootstrap hint for joining the orderbook torrent:
https://extro.network This is a public discovery hint only. The site does not fetch or proxy the book; your wallet joins the swarm directly.