As far as I can read nobody replied to the initial question: what is considered as good/best practice to store in Bitcoin?

Reiterating my question: what are the current rules for OP_RETURN, max size and number of OP_RETURN per tx

On Wed, Feb 01, 2023 at 02:02:41PM +0000, Andrew Poelstra wrote:

On Tue, Jan 31, 2023 at 09:07:16PM -0500, Peter Todd via bitcoin-dev wrote:

On January 31, 2023 7:46:32 PM EST, Christopher Allen via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote:

All other things being equal, which is better if you need to place a
64-bytes into the Bitcoin blockchain? A traditional OP_RETURN or a spent
taproot transaction such as:

OP_FALSE
OP_IF
OP_PUSH my64bytes
OP_ENDIF

What's wrong with OpPush <data> OpDrop?

This is a technical nit, but the reason is that <data> is limited to 520
bytes (and I believe, 80 bytes by standardness in Taproot), so if you
are pushing a ton of data and need multiple pushes, it's more efficient
to use FALSE IF ... ENDIF since you avoid the repeated DROPs.

Yes, for more than 520 bytes you need to wrap the push in an IF/ENDIF so it's
not executed. But in this example we're just talking about 64 bytes, so that
limit isn't relevant and OpPush <data> OpDrop should be sufficient.

Specifically for more than 520 bytes you run into the the
MAX_SCRIPT_ELEMENT_SIZE check in script/interpreter.cpp, which applies to all
scripts regardless of standardness at script execution:

           //
           // Read instruction
           //
           if (!script.GetOp(pc, opcode, vchPushValue))
               return set_error(serror, SCRIPT_ERR_BAD_OPCODE);
           if (vchPushValue.size() > MAX_SCRIPT_ELEMENT_SIZE)
               return set_error(serror, SCRIPT_ERR_PUSH_SIZE);

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