We have a fair exchange contract that provides two-party, well-defined asset exchanges. The old Gipsy exchange contract family also supported a multi-party auction.
The Gipsy auction API is described here:
Auction Contract
The auction contract handles a multi-party auction for transfer of
ownership of assets between ledgers. For example, Alice offers three
blue marbles in exchange for the highest possible number of red
marbles.
State Update Methods
(cancel-auction)\
Cancel the offer, must be invoked by the auction creator. May not be
invoked once the auction is closed.
(cancel-bid)\
Cancel a bid, must be invoked by the object creator. May not be invoked
by the auction winner once the auction is closed.
(close-auction)\
Close the auction to further bidding. Commits the highest bidder to the
result of the auction. Must be invoked by the auction creator.
(confirm-close)\
Confirm that the auction is closed. Must be invoked by the highest bidder.
(initialize _serialized-asset-request _root-authority-key)\
Initialize the object, must be invoked by the object creator.
_root-authority-key -- ECDSA key for an asset authority (either an issuer or
vetting organization that provides the root of trust
(offer-asset _serialized-authoritative-asset)\
Offer an asset, must be invoked by the object creator.
_serialized-authoritative-asset -- the
serialized asset that will be offered for exchange
(submit-bid _serialized-authoritative-asset)\
Submit a bid to the auction with an escrowed assets, the offered asset
must match the asset request including the minimum bid.
_serialized-authoritative-asset -- the
serialized asset that is offered in response to the
auction
Immutable Methods
(get-verifying-key)\
Get the verifying key for the contract object.
RETURNS -- an ECDSA verifying key
(cancel-auction-attestation)\
Get an attestation from the contract object that allows for release from escrow of offered assets.
RETURNS -- (dependencies signature)
(cancel-bid-attestation)\
Get an attestation from the contract object that allows for release from escrow of bid assets.
RETURNS -- (dependencies signature)
(check-bid)\
Get information about the bid submitted by the requestor.
We have a fair exchange contract that provides two-party, well-defined asset exchanges. The old Gipsy exchange contract family also supported a multi-party auction.
The Gipsy auction API is described here:
Auction Contract
The auction contract handles a multi-party auction for transfer of ownership of assets between ledgers. For example, Alice offers three blue marbles in exchange for the highest possible number of red marbles.
State Update Methods
(cancel-auction)\ Cancel the offer, must be invoked by the auction creator. May not be invoked once the auction is closed.(cancel-bid)\ Cancel a bid, must be invoked by the object creator. May not be invoked by the auction winner once the auction is closed.(close-auction)\ Close the auction to further bidding. Commits the highest bidder to the result of the auction. Must be invoked by the auction creator.(confirm-close)\ Confirm that the auction is closed. Must be invoked by the highest bidder.(initialize _serialized-asset-request _root-authority-key)\ Initialize the object, must be invoked by the object creator._serialized-asset-request-- serialized asset request_root-authority-key-- ECDSA key for an asset authority (either an issuer or vetting organization that provides the root of trust(offer-asset _serialized-authoritative-asset)\ Offer an asset, must be invoked by the object creator._serialized-authoritative-asset-- the serialized asset that will be offered for exchange(submit-bid _serialized-authoritative-asset)\ Submit a bid to the auction with an escrowed assets, the offered asset must match the asset request including the minimum bid._serialized-authoritative-asset-- the serialized asset that is offered in response to the auctionImmutable Methods
(get-verifying-key)\ Get the verifying key for the contract object.(cancel-auction-attestation)\ Get an attestation from the contract object that allows for release from escrow of offered assets.(dependencies signature)(cancel-bid-attestation)\ Get an attestation from the contract object that allows for release from escrow of bid assets.(dependencies signature)(check-bid)\ Get information about the bid submitted by the requestor.(claim-bid)\ Create a claim that can be given to the issuer of the bid assets to claim ownership. Must be invoked by the auction creator.(old-owner-identity dependencies signature)(claim-offer)\ Create a claim that can be given to the issuer of the offered assets to claim ownership. Must be invoked by the winning bidder.(old-owner-identity dependencies signature)(examine-offered-asset)\ Get information about the asset that is offered for exchange.(examine-requested-asset)\ Get information about the asset that is requested.(max-bid)\ Get information about the current maximum bid.(asset-type-id amount)auction.md
This would be a good first contract to develop.