rollkit-btc:

This package provides a reader / writer interface to bitcoin.

Example:

embeddedData := []byte("00")
address, err := createTaprootAddress(embeddedData)
if err != nil {
	fmt.Println(err)
	return
}
relayer, err := NewRelayer()
if err != nil {
	fmt.Println(err)
	return
}
defer relayer.Close()
hash, err := relayer.commitTx(address)
if err != nil {
	fmt.Println(err)
	return
}
err = relayer.revealTx(hash)
if err != nil {
	fmt.Println(err)
	return
}

Writer:

A commit transaction containing a taproot with one leaf script

OP_0
OP_IF
<embedded data>
OP_ENDIF

is used to create a new bech32m address and is sent an output.

A reveal transaction then posts the embedded data on chain and spends the commit output.

Reader:

The address of the reveal transaction is implicity used as a namespace.

Clients may call listunspent on the reveal transaction address to get a list of transactions and read the embedded data from the first witness input.