OP RETURN

OP_RETURN is a script opcode used to mark a transaction output as invalid. Since any outputs with OP_RETURN are provably unspendable, OP_RETURN outputs can be used to burn bitcoins.

"Bitcoin (BTC) and Bitcoin SV have this thing called OP_RETURN, which is a script opcode used to mark a transaction output as invalid.

In BTC’s op_return only a tiny amount of data is allowed. BSV allows lots more data to be included in op_return outputs.

In layman’s terms, it means by sending a transaction you can include some arbitrary data and have that data written to the blockchain.

This has resulted in numbers of people building blockchain based apps on BSV. Bitstagram is, as you might guess, like Instagram but it’s all stored on Bitcoin. You pay to upload, and you can tip the publisher. Twetch is like Twitter, but on the blockchain. You pay to post, and you also get paid via tips. All the data is posted as an op_return output and stored on the BSV blockchain. It’s supposedly immutable, as no-one can ever delete your transactions which hold your posts’ data, unlike Twitter and Facebook."