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Custody

MPC, multisig, and an HSM are different controls.

Ask where the rule lives, who can ask for a signature, and what happens when a person or a vendor disappears. Do not ask which logo is more institutional.

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The distinction

Multisig is a rule the ledger, or a contract, can check: more than one signature. MPC produces one signature from shares, so the chain may only see a normal key. An HSM is a box that holds material and signs inside it. You can combine them. Combining them does not name an owner.

What to write down

  • Who proposes a withdrawal.
  • The threshold, and whether the chain can see it.
  • Recovery if one holder leaves or dies.
  • What a vendor outage does to the ability to move.
  • Who is allowed to change the policy.

What this is not

Not a ranking of vendors. Not a statement that any arrangement is regulated. Blockchain Lab does not hold customer assets. Provider comparison, where it exists, sits with Custody.io as a public product, not as a claim of ownership.