OP_RETURN with Multisig Let's say I have wallets A,B,C.
A funds multisig address with B and C.
B &amp; C show keys, get input and spent it to OP_RETURN transactions.

Is it possible?
If this is what you are proposing:

Address A: 1Axyz...
Address B: 1Bxyz...
Address C: 1Cxyz...

Tx1

A -&gt; Multisig requiring 1 of 2 signatures from pubkeys of B &amp; C

Tx2

Tx1 output 0 -&gt; OP_RETURN


Then yes, that's totally legal on the blockchain. Not sure why you would want to do it, though.