[zapps-wg] Sapling MPC Random Beacon

[Sean Bowe]

Please see the attached random beacon announcement.

Sean

Hi all!

I'm happy to announce that the Zcash "Sapling" MPC is nearly finished! I'd like to
thank the roughly 94 participants that contributed their time and effort to making
Zcash safer. I'd also like to thank Ian Munoz from the Zcash Company for
coordinating the ceremony.

Just as in the Powers of Tau, we must apply a random beacon to the result, like
a simulated participant. We'll be performing 2^42 iterations of SHA256 over the
block hash of Bitcoin block 534861, which is expected several hours from now.

The resulting value will be applied with the `beacon` tool in the `sapling-mpc`
repository to produce the final parameters. Here are the SHA256 hashes of the files
currently located in my `sapling-mpc` repository:

Cargo.toml:
92e609de0ba615dd43e2866a2eb34505a19164bf48cca2250860093dfc37bcaa
Cargo.lock:
1317e82bdba7e7fe91195619803cbd12488ec589304198d8c20774f3b9ef0d1a
src/bin/beacon.rs:
cdfbf4bd833f2ba014ce41288fd7fa7f85ca49c7d8a47693044797a052ce9c61
src/bin/compute.rs:
2f6cdba8fcc4aa4b63bb02110552fac138254df55d2447a09e9a1a7a6eb94b30
src/bin/new.rs:
6363c65004733394f994a1c7feac32e5f1a1edd3d0da144cdf320d54bffb0e22
src/bin/split_params.rs:
ba80ae3ef719aad5cfb4b971af4f8276bbab7752f0516926dd72ba625f5ccc1c
src/bin/verify.rs:
7d61288c703098372038c30069dd8abb068ebfeded4f6935ff53c41fe01438af
src/bin/verify_transform.rs:
c8ce872e0d1212fcbcab92f84ba1c148601f7aa20e6b156de90dde94a95d4107

Here's the SHA256 hash of the current `params` before applying the beacon:

73baba221c0e0618a817f32ab6c224eb9f2621922829a65e281ccf0a99cdf74f

Sean Bowe
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