How it works
<p>
Now to give you some idea of how it works, here are some examples.
</p>
<b>A typical transfer, in this case from the vault to a user.</b>
<pre>
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Transaction: Transfer
Amount: 50
Units: g
Commodity: Pb
Held at: 8848B28EAD79B3FC70996D3F9181B9B1B4DC635B
Destination: 8616CC249261CDFCCBC24AD1D4215A25457C49F4
Seconds Till Expiry: 200
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)

iD8DBQFKXAyckYG5sbTcY1sRAuf5AJ9TZIpKSy5Ag7Z4vpjbdF5DOjXenwCdEI3e
ma60KH6XRg0tLWSVfR+Q5TI=
=uvRL
-----END PGP SIGNATURE-----
</pre>
<b>The vaults response</b>
<pre>
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Processing started at 1247546540
Response to request ID: /4m34Uep8jUnIWlx8VOEMfkWrFM
Transfered: 50.000000 g of Pb
From: 8848B28EAD79B3FC70996D3F9181B9B1B4DC635B
To: 8616CC249261CDFCCBC24AD1D4215A25457C49F4
Transaction completed.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)

iD8DBQFKXAyskYG5sbTcY1sRAt9aAJ9dXPHelszjleTVOgTg5GiYc5hveACfZypZ
qiH3z+6VgSGt/Lw3vLACoec=
=Gfzx
-----END PGP SIGNATURE-----
</pre>
<b>A balance request</b>
<pre>
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Transaction: Balance Request
Commodity: Pb
Held at: 8848B28EAD79B3FC70996D3F9181B9B1B4DC635B
Seconds Till Expiry: 60
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)

iD8DBQFKXA2w1CFaJUV8SfQRAvs5AJ46yeagGDcAABHsTKZnZyG3LNgMQgCeMc4P
+CXRwgdjobeVI5geyI89wEg=
=93Zv
-----END PGP SIGNATURE-----
</pre>
<b>And the reposnse again is</b>
<pre>
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Processing started at 1247546809
Balance Statement
Response to request ID: FHJ8ReS4mkSbQ6KyJTq9nJDv7QY
Public key 8616CC249261CDFCCBC24AD1D4215A25457C49F4
Has balance: 50.000000 g of Pb
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)

iD8DBQFKXA25kYG5sbTcY1sRAtOCAKDjE69POIVnYU75kSm15ohXk7h/rgCeLmLJ
b4VXouM2GuSWdQoPrX5SkrU=
=s2eg
-----END PGP SIGNATURE-----
</pre>
<p>
The expiry time is to limit how long to hold onto transactions to ensure 
that duplicates are not processed.  Long expiry times will likely have to 
attract a fee if storage or processing time becomes an issue.
</p>

<p>
No fees are expected to be charged for this system unless genuine operating 
costs require it.  All you need is a gpg key to use it. 
</p>