DATUM - Coinbase Tag Question \ stacker news ~bitcoin

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311 sats \ 7 comments \ @BeeAye 26 Nov bitcoin_Mining

One of the cool thing's about mining with DATUM (https://ocean.xyz/docs/datum) is that one can select the coinbase tags that would be visible in, say, mempool.space if you were lucky enough to mine a new block. if mining with DATUM using a pool, only the seconday tag would appear, and if solo mining with DATUM you can fill both coinbase tags. Here is an example from my DATUM service config options via Start9:

So, I'm wondering: does anyone know if there are character limits or restricted characters for these fields, whether thats a restriction related to my bitcoin node or the DATUM software?

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101 sats \ 5 replies \ @bren 26 Nov

These are the only two limitations I am aware of.

Signature Script: The maximum size is 10,000 bytes. Transaction Size: The entire transaction must be less than or equal to 1 megabyte (1,000,000 bytes).

0 sats \ 4 replies \ @BeeAye OP 26 Nov

so i could like...put the lyrics to an entire song in the coinbase? 😅

95 sats \ 3 replies \ @bren 26 Nov

Yeah, you’re totally right—this is pretty much how Satoshi embedded his message in the coinbase.

As for the limits, here’s what I know:

Coinbase Transaction Size: The whole transaction, including any custom tags or data, has to fit within the block size limit (4MB for SegWit blocks).
Coinbase ScriptSig: The ScriptSig field in the coinbase is capped at 100 bytes. This is usually where miners put their custom tags or messages.

So, while you can definitely add a short phrase or a snippet (like part of a song lyric), there’s no way you could fit an entire song.

0 sats \ 2 replies \ @BeeAye OP 26 Nov

interesting. I wonder if there is a validation built into the DATUM service on Start9 that would stop someone from accidentally inputting a tag that is too big. what a tragedy if it like...fucked up your mined solo block 😬

0 sats \ 1 reply \ @bren 26 Nov

Great question! It would be good to have feedback from others as well, not just from me. That would be terrible if it happened. I don't have the resources right now, but there’s a list of weak Bitcoin private keys worth exploring. Recently, someone discovered a complex one. They managed to find the private key but were front-run when attempting to cash out. Truly a tragedy.

0 sats \ 0 replies \ @BeeAye OP 27 Nov

0 sats \ 0 replies \ @bren 26 Nov

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