dead man's switch

split your seed phrase into 3 shards using shamirs secret sharing. any 2 shards can recover your seed. 1 shard alone = nothing.

100% client-side. your seed never leaves your browser.

step 1: enter your secret

enter your 12 or 24 word bip-39 seed phrase:

step 2: save your shards

done! your seed has been split into 3 shards. any 2 can recover it.

shard A (your backup)

shard B (for beneficiary)

shard C (server shard)

save all 3 shards before continuing. you need at least 2 to recover.

step 3: activate the switch

activation required

the seed-splitting tool is free for everyone, but to store Shard C in our secure vault and activate the dead man's switch, you need an active membership.

view pricing & plans

recover from shards

have 2 shards? combine them to recover your seed:

shard 1:

shard 2:

how it works

your seed is split using shamirs secret sharing (2-of-3 threshold)
any single shard reveals nothing about the original seed
any 2 shards can fully reconstruct the seed
all splitting happens in your browser - seed never hits the network