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Updated URL for drand specification and various other links #1309

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Updated URL for drand specification and various other links #1309

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a7187d2
Updated URL for drand specification and various other links
CluEleSsUK Dec 12, 2022
7cced46
Merge branch 'master' into master
smagdali Jul 14, 2023
3fb6639
Merge branch 'master' into master
smagdali Jul 16, 2023
16ac33d
Merge branch 'master' into master
smagdali Jul 16, 2023
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5 changes: 4 additions & 1 deletion content/libraries/drand/_index.md
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Expand Up @@ -29,19 +29,22 @@ By polling the appropriate endpoint (see below for specifics on the drand networ
```json
{
"round": 367,
"randomness": "3439d92d58e47d342131d446a3abe264396dd264717897af30525c98408c834f",
"signature": "b62dd642e939191af1f9e15bef0f0b0e9562a5f570a12a231864afe468377e2a6424a92ccfc34ef1471cbd58c37c6b020cf75ce9446d2aa1252a090250b2b1441f8a2a0d22208dcc09332eaa0143c4a508be13de63978dbed273e3b9813130d5",
"previous_signature": "afc545efb57f591dbdf833c339b3369f569566a93e49578db46b6586299422483b7a2d595814046e2847494b401650a0050981e716e531b6f4b620909c2bf1476fd82cf788a110becbc77e55746a7cccd47fb171e8ae2eea2a22fcc6a512486d"
}
```

Specifically, we have:

- `Randomness` -- SHA256 hash of the signature
- `Signature` -- the threshold BLS signature on the previous signature value `Previous` and the current round number `round`.
- `PreviousSignature` -- the threshold BLS signature from the previous drand round.
- `Round` -- the index of Randomness in the sequence of all random values produced by this drand network.

Specifically, the message signed is the concatenation of the round number treated as a uint64 and the previous signature. At the moment, drand uses BLS signatures on the BLS12-381 curve with the latest v7 RFC of hash-to-curve and the signature is made over G1 (for more see the [drand specification](https://drand.love/docs/specification/#cryptographic-specification).


## Polling the drand network

Filecoin nodes fetch the drand entry from the distribution network of the
Expand Down Expand Up @@ -69,7 +72,7 @@ endpoint.
Thereafter, the Filecoin client can call drand's endpoints:

- `/public/latest` to get the latest randomness value produced by the beacon
- `/public/<round>` to get the randoomness value produced by the beacon at a given round
- `/public/<round>` to get the randomness value produced by the beacon at a given round

## Using drand in Filecoin

Expand Down
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