Quick start guide

Build from sources

1. Intsall Haskell Tool Stack.

2. Download Spedn sources.

   $ git clone https://bitbucket.org/o-studio/spedn.git
   

3. Build and install Spedn.

   $ cd spedn/spedn
   $ stack install
   

Installation from npm

Alternatively, you can install a JavaScript version from npmjs repository:

$ npm i -g spedn-cli

Your first contract

Create a file mycontract.spedn with a following content:

contract ExpiringTip(Ripemd160 alice, Ripemd160 bob) {

    challenge receive(Sig sig, PubKey pubKey) {
        verify hash160(pubKey) == bob;
        verify checkSig(sig, pubKey);
    }

    challenge revoke(Sig sig, PubKey pubKey) {
        verify checkSequence(7d);
        verify hash160(pubKey) == alice;
        verify checkSig(sig, pubKey);
    }
}

Compile with command:

$ spedn compile -c mycontract.spedn

You should get a compiled contract template similar to this:

<alice> <bob> 2 PICK TRUE EQUAL IF 3 PICK HASH160 OVER EQUALVERIFY (...)