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onion-soup

Yes. It lives as a transaction output under op code 'OP_RETURN'.

See example of weather data stored on chain https://whatsonchain.com/tx/6dac238576e9778458bb62a2f7d936fd...

>are there fees to host this data (as we need to pay miners to include data in a block)?

Yes, current fees are about 1 sat/byte.

This is really a write once, read many type of system.

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So it will be roughly $115 USD per megabyte? (1% of a BTC). High, but at least you get a 10000x replication factor.

No, it will be around 20 cents to store 1MB

I can see use cases where this would be worthwhile.

Not so much for backing up your photo collection, but more along the lines of publishing some textual information that someone powerful does not want published. It could even potentially function as a sort of notary service.

> 1 sat/byte

What's a sat?

1 satoshi = smallest current unit of a bitcoin = 0.00000001฿

1 satoshi per byte. 1 satoshi = 0.00000001 BSV

Presumably a Satoshi, the nickname given to the current smallest fraction of a bitcoin that is recorded on the block chain - 0.00000001 BTC.

https://en.bitcoin.it/wiki/Satoshi_(unit)

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