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73 lines
2.9 KiB
Markdown
73 lines
2.9 KiB
Markdown
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# I2P support in Bitcoin Core
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It is possible to run Bitcoin Core as an
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[I2P (Invisible Internet Project)](https://en.wikipedia.org/wiki/I2P)
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service and connect to such services.
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This [glossary](https://geti2p.net/en/about/glossary) may be useful to get
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started with I2P terminology.
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## Run Bitcoin Core with an I2P router (proxy)
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A running I2P router (proxy) with [SAM](https://geti2p.net/en/docs/api/samv3)
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enabled is required (there is an [official one](https://geti2p.net) and
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[a few alternatives](https://en.wikipedia.org/wiki/I2P#Routers)). Notice the IP
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address and port the SAM proxy is listening to; usually, it is
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`127.0.0.1:7656`. Once it is up and running with SAM enabled, use the following
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Bitcoin Core options:
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```
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-i2psam=<ip:port>
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I2P SAM proxy to reach I2P peers and accept I2P connections (default:
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none)
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-i2pacceptincoming
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If set and -i2psam is also set then incoming I2P connections are
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accepted via the SAM proxy. If this is not set but -i2psam is set
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then only outgoing connections will be made to the I2P network.
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Ignored if -i2psam is not set. Listening for incoming I2P
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connections is done through the SAM proxy, not by binding to a
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local address and port (default: 1)
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```
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In a typical situation, this suffices:
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```
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bitcoind -i2psam=127.0.0.1:7656
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```
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The first time Bitcoin Core connects to the I2P router, its I2P address (and
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corresponding private key) will be automatically generated and saved in a file
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named `i2p_private_key` in the Bitcoin Core data directory.
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## Additional configuration options related to I2P
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You may set the `debug=i2p` config logging option to have additional
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information in the debug log about your I2P configuration and connections. Run
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`bitcoin-cli help logging` for more information.
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It is possible to restrict outgoing connections in the usual way with
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`onlynet=i2p`. I2P support was added to Bitcoin Core in version 22.0 (mid 2021)
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and there may be fewer I2P peers than Tor or IP ones. Therefore, using
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`onlynet=i2p` alone (without other `onlynet=`) may make a node more susceptible
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to [Sybil attacks](https://en.bitcoin.it/wiki/Weaknesses#Sybil_attack). Use
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`bitcoin-cli -addrinfo` to see the number of I2P addresses known to your node.
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## I2P related information in Bitcoin Core
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There are several ways to see your I2P address in Bitcoin Core:
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- in the debug log (grep for `AddLocal`, the I2P address ends in `.b32.i2p`)
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- in the output of the `getnetworkinfo` RPC in the "localaddresses" section
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- in the output of `bitcoin-cli -netinfo` peer connections dashboard
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To see which I2P peers your node is connected to, use `bitcoin-cli -netinfo 4`
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or the `getpeerinfo` RPC (e.g. `bitcoin-cli getpeerinfo`).
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To see which I2P addresses your node knows, use the `getnodeaddresses 0 i2p`
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RPC.
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## Compatibility
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Bitcoin Core uses the [SAM v3.1](https://geti2p.net/en/docs/api/samv3) protocol
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to connect to the I2P network. Any I2P router that supports it can be used.
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