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**What type of PR is this?**
Feature
**What does this PR do? Why is it needed?**
| Feature | Semi-Supernode | Supernode |
| ----------------------- | ------------------------- |
------------------------ |
| **Custody Groups** | 64 | 128 |
| **Data Columns** | 64 | 128 |
| **Storage** | ~50% | ~100% |
| **Blob Reconstruction** | Yes (via Reed-Solomon) | No reconstruction
needed |
| **Flag** | `--semi-supernode` | `--supernode` |
| **Can serve all blobs** | Yes (with reconstruction) | Yes (directly) |
**note** if your validator total effective balance results in more
custody than the semi-supernode it will override those those
requirements.
cgc=64 from @nalepae
Pro:
- We are useful to the network
- Less disconnection likelihood
- Straight forward to implement
Con:
- We cannot revert to a full node
- We have to serve incoming RPC requests corresponding to 64 columns
Tested the following using this kurtosis setup
```
participants:
# Super-nodes
- el_type: geth
el_image: ethpandaops/geth:master
cl_type: prysm
vc_image: gcr.io/offchainlabs/prysm/validator:latest
cl_image: gcr.io/offchainlabs/prysm/beacon-chain:latest
count: 2
cl_extra_params:
- --supernode
vc_extra_params:
- --verbosity=debug
# Full-nodes
- el_type: geth
el_image: ethpandaops/geth:master
cl_type: prysm
vc_image: gcr.io/offchainlabs/prysm/validator:latest
cl_image: gcr.io/offchainlabs/prysm/beacon-chain:latest
count: 2
validator_count: 1
cl_extra_params:
- --semi-supernode
vc_extra_params:
- --verbosity=debug
additional_services:
- dora
- spamoor
spamoor_params:
image: ethpandaops/spamoor:master
max_mem: 4000
spammers:
- scenario: eoatx
config:
throughput: 200
- scenario: blobs
config:
throughput: 20
network_params:
fulu_fork_epoch: 0
withdrawal_type: "0x02"
preset: mainnet
global_log_level: debug
```
```
curl -H "Accept: application/json" http://127.0.0.1:32961/eth/v1/node/identity
{"data":{"peer_id":"16Uiu2HAm7xzhnGwea8gkcxRSC6fzUkvryP6d9HdWNkoeTkj6RSqw","enr":"enr:-Ni4QIH5u2NQz17_pTe9DcCfUyG8TidDJJjIeBpJRRm4ACQzGBpCJdyUP9eGZzwwZ2HS1TnB9ACxFMQ5LP5njnMDLm-GAZqZEXjih2F0dG5ldHOIAAAAAAAwAACDY2djQIRldGgykLZy_whwAAA4__________-CaWSCdjSCaXCErBAAE4NuZmSEAAAAAIRxdWljgjLIiXNlY3AyNTZrMaECulJrXpSOBmCsQWcGYzQsst7r3-Owlc9iZbEcJTDkB6qIc3luY25ldHMFg3RjcIIyyIN1ZHCCLuA","p2p_addresses":["/ip4/172.16.0.19/tcp/13000/p2p/16Uiu2HAm7xzhnGwea8gkcxRSC6fzUkvryP6d9HdWNkoeTkj6RSqw","/ip4/172.16.0.19/udp/13000/quic-v1/p2p/16Uiu2HAm7xzhnGwea8gkcxRSC6fzUkvryP6d9HdWNkoeTkj6RSqw"],"discovery_addresses":["/ip4/172.16.0.19/udp/12000/p2p/16Uiu2HAm7xzhnGwea8gkcxRSC6fzUkvryP6d9HdWNkoeTkj6RSqw"],"metadata":{"seq_number":"3","attnets":"0x0000000000300000","syncnets":"0x05","custody_group_count":"64"}}}
```
```
curl -s http://127.0.0.1:32961/eth/v1/debug/beacon/data_column_sidecars/head | jq '.data | length'
64
```
```
curl -X 'GET' \
'http://127.0.0.1:32961/eth/v1/beacon/blobs/head' \
-H 'accept: application/json'
```
**Which issues(s) does this PR fix?**
Fixes #
**Other notes for review**
**Acknowledgements**
- [x] I have read [CONTRIBUTING.md](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md).
- [x] I have included a uniquely named [changelog fragment file](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md#maintaining-changelogmd).
- [x] I have added a description to this PR with sufficient context for reviewers to understand this PR.
---------
Co-authored-by: Preston Van Loon <pvanloon@offchainlabs.com>
Co-authored-by: james-prysm <jhe@offchainlabs.com>
Co-authored-by: Manu NALEPA <enalepa@offchainlabs.com>
