Warpcast

Technowatermelon. Elder Millenial. Building Farcaster. 

nf.td/varun

I'm eth newbie..just learning
(working on @farcaster)

terminally.online

Where is the private key for warpcast wallet stored? cc @horsefacts.eth @v

private key is shamir sharded on your device into 3 shards, any 2 of which can reconstruct the PK

1 shard remains on the device
1 shard is encrypted by a key that warpcast holds (recovery shard)
1 shard is encrypted by a key that Privy holds (auth shard)

all encryption also happens on your client

effectively the recovery and auth shards are both accessible by your custody address but via authing with two separate service providers

it’d take two separate breaches of warpcast and privy to compromise key material 

the reasons for doing this instead of  simple EOA are 
1) users won’t lose access to their funds bc it inherits the Farcaster recovery system since 2/3 can be accessed via SIWF (all without needing the user to backup anything themselves)
2) users can seamlessly access their wallet on any device (i.e. web) without needing to manually move a seed phase around in a reasonably secure way

Building @warpcast and @farcaster, new dad, like making food