Feature request: Increase OP_RETURN

[shawnshaddock]

It's becoming popular to use OP_RETURN to store data on chain to build applications and protocols (see https://memo.cash/protocol). Projects like BitcoinABC are embracing this with large blocks and larger OP_RETURN.

BitSend with 10mb blocks + segwit has lots of room for a larger OP_RETURN, this would open up lots of opportunities for building on top of the BitSend network.

For reference, BitcoinABC will have 32 mb blocks and 223 byte OP_RETURN.
https://github.com/Bitcoin-ABC/bitcoin-abc/search?utf8=%E2%9C%93&q=MAX_OP_RETURN_RELAY&type=

[joshafest]

hi , this is a good idea. But instead we can add a field directly to block which will give more freedom