Whats a good ETH notary service since BTC based OP_RETRUN txns are taboo.

I want to notarize a `SHA256` hash of a document I have. Before ETH I would have used a BTC `OP_RETURN` transaction service. Since BTC is trying to reduce notary spam, what would be a good ETH notary service that people might recommend that the ETH community doesn’t frown upon?

* [A look at OP_RETURN and whether embedding arbitrary data into Bitcoin’s blockchain is spam](https://www.theblockcrypto.com/2019/01/09/a-look-at-op_return-and-whether-embedding-arbitrary-data-into-bitcoins-blockchain-is-spam/)

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