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Background
By default At the time of writing Iroha works with single-signature transactions which are accepted by the peers signed only by one signatory. However in some cases it is not enough.
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- First client to submit the MST transactions, submits it normally as any other transaction
- Other clients that want to add signatures to this tx request this tx, send a special message `AddSignatureToTransaction` with a signed hash of the original transaction.The hash can be obtained by fetching pending transactions for a particular userpending tx from the Iroha peer and sign it with their signature and resubmit it.
But the UX does not need to change for the end user. For example:
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