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1. Transfer from third-party blockchain to Iroha.
   1. Alice sends TOK to vault
   2. Alice sends proof of transaction inclusion in block to a bridge client
   3. Bridge contract unlocks & transfers tokens to Alice on Iroha
2. Transfer from Iroha to third-party blockchain
   1. Alice sends TOK-asset to bridge contract
   2. Bridge contract signals to vault
   3. Vault observes the command, releases and transfers TOKs to Alice
   4. Vault finishes the process by proofing the transfer to bridge contract, then bridge contract releases the collateral to the vault in Iroha
   5. Otherwise, the locker receives his tokens back

Making bridges trustless

AnchortrustlesstrustlessIn order to make the functionality described above trustless, we need to have the following on Iroha:

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