1 files changed, 1 insertions, 107 deletions
diff --git a/docs/solidity-by-example.rst b/docs/solidity-by-example.rst
index ddead4d5..933b0765 100644
--- a/docs/solidity-by-example.rst
+++ b/docs/solidity-by-example.rst
@@ -5,113 +5,7 @@ Solidity by Example
 .. include:: examples/voting.rst
 .. include:: examples/blind-auction.rst
 
-.. index:: purchase, remote purchase, escrow
-
-********************
-Safe Remote Purchase
-********************
-
-::
-
-    pragma solidity >=0.4.22 <0.6.0;
-
-    contract Purchase {
-        uint public value;
-        address payable public seller;
-        address payable public buyer;
-        enum State { Created, Locked, Inactive }
-        State public state;
-
-        // Ensure that `msg.value` is an even number.
-        // Division will truncate if it is an odd number.
-        // Check via multiplication that it wasn't an odd number.
-        constructor() public payable {
-            seller = msg.sender;
-            value = msg.value / 2;
-            require((2 * value) == msg.value, "Value has to be even.");
-        }
-
-        modifier condition(bool _condition) {
-            require(_condition);
-            _;
-        }
-
-        modifier onlyBuyer() {
-            require(
-                msg.sender == buyer,
-                "Only buyer can call this."
-            );
-            _;
-        }
-
-        modifier onlySeller() {
-            require(
-                msg.sender == seller,
-                "Only seller can call this."
-            );
-            _;
-        }
-
-        modifier inState(State _state) {
-            require(
-                state == _state,
-                "Invalid state."
-            );
-            _;
-        }
-
-        event Aborted();
-        event PurchaseConfirmed();
-        event ItemReceived();
-
-        /// Abort the purchase and reclaim the ether.
-        /// Can only be called by the seller before
-        /// the contract is locked.
-        function abort()
-            public
-            onlySeller
-            inState(State.Created)
-        {
-            emit Aborted();
-            state = State.Inactive;
-            seller.transfer(address(this).balance);
-        }
-
-        /// Confirm the purchase as buyer.
-        /// Transaction has to include `2 * value` ether.
-        /// The ether will be locked until confirmReceived
-        /// is called.
-        function confirmPurchase()
-            public
-            inState(State.Created)
-            condition(msg.value == (2 * value))
-            payable
-        {
-            emit PurchaseConfirmed();
-            buyer = msg.sender;
-            state = State.Locked;
-        }
-
-        /// Confirm that you (the buyer) received the item.
-        /// This will release the locked ether.
-        function confirmReceived()
-            public
-            onlyBuyer
-            inState(State.Locked)
-        {
-            emit ItemReceived();
-            // It is important to change the state first because
-            // otherwise, the contracts called using `send` below
-            // can call in again here.
-            state = State.Inactive;
-
-            // NOTE: This actually allows both the buyer and the seller to
-            // block the refund - the withdraw pattern should be used.
-
-            buyer.transfer(value);
-            seller.transfer(address(this).balance);
-        }
-    }
+.. include:: examples/safe-remote.rst
 
 ********************
 Micropayment Channel