<commit_before># uCoin Gossip messages format

## Peering table

uCoin uses P2P networks to manage money data, hence it needs to know which nodes makes the network for a given currency.

For that purpose, uCoin defines a peering table containing, for a given currency and host's PGP key:

* a DNS name
* a network IP (v4, v6 or both)
* a port

This link is made through a document called *peering entry* whose format is:

```plain
Version: VERSION
Currency: CURRENCY_NAME
Fingerprint: A70B8E8E16F91909B6A06DFB7EEF1651D9CCF468
Dns: DNS_NAME
IPv4: IPV4_ADDRESS
IPv6: IPV6_ADDRESS
Port: PORT_NUMBER
```
Field | Description
----- | -----------
`Version` | denotes the current structure version.
`Currency` | contains the name of the currency.
`Fingerprint` | PGP key identifier linked to this address.
`Dns` | the DNS name to access the node.
`IPv4` | the IPv4 address to access the node.
`IPv6` | the IPv6 address to access the node.
`Port` | the port of the address to access the node.
With the signature attached, this document certifies that this fingerprint's key is owned by host at given network address.

The aggregation of all peering entries is called the *peering table*, and allows to authentify addresses of all nodes identified by their PGP key's fingerprint.

## Forward request

In addition to peering table, which only allows to know the address of each peer, *forward request* is a document allowing peers to ask each other to be forwarded of specific transactions when received.

*Forward table* can be seen as an address book, and *forward requests* as rules of sending.
<commit_msg>Update UCG: change peering entry format<commit_after># uCoin Gossip messages format

## Peering entry

uCoin uses P2P networks to manage money data, hence it needs to know which nodes make the network for a given currency.

For that purpose, uCoin defines a peering table containing, for a given node PGP key:

* a currency name
* a list of endpoints to contact the node

This link is made through a document called *peering entry* whose format is:

```plain
Version: VERSION
Currency: CURRENCY_NAME
Fingerprint: NODE_FINGERPRINT
Endpoints:
END_POINT_1
END_POINT_2
END_POINT_3
[...]
```
With the signature attached, this document certifies that this fingerprint's key is owned by host at given network endpoints.

The aggregation of all peering entries is called the *peering table*, and allows to authentify addresses of all nodes identified by their PGP key's fingerprint.

### Fields details

Field | Description
----- | -----------
`Version` | denotes the current structure version.
`Currency` | contains the name of the currency.
`Fingerprint` | PGP key identifier owned by this node.
`Endpoints` | a list of endpoints to interact with the node

`Endpoints` has a particular structure: it is made up of at least one line with each line following format:

```
PROTOCOL_NAME[ OPTIONS]
[...]
```

For example, the first written uCoin peering protocol is BASIC_MERKLED_API, which defines an HTTP API. An endpoint of such protocol would look like:

```
BASIC_MERKLED_API[ DNS][ IPv4][ IPv6] PORT
```

Where :

Field | Description
----- | -----------
`DNS` | is the dns name to access the node.
`IPv4` | is the IPv4 address to access the node.
`IPv6` | is the IPv6 address to access the node.
`PORT` | is the port of the address to access the node.

### Example

```plain
Version: 1
Currency: beta_brousouf
Fingerprint: A70B8E8E16F91909B6A06DFB7EEF1651D9CCF468
Endpoints:
BASIC_MERKLED_API some.dns.name 172.16.58.3 2001:0db8:0000:85a3:0000:0000:ac1f 9001
BASIC_MERKLED_API some.dns.name 172.16.58.3 2001:0db8:0000:85a3:0000:0000:ac1f 9002
OTHER_PROTOCOL 172.16.58.3 9001
```
## Forward request

In addition to peering table, which only allows to know the address of each peer, *forward request* is a document allowing peers to ask each other to be forwarded of specific transactions when received.

*Forward table* can be seen as an address book, and *forward requests* as rules of sending.

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