rollkit-btc:

This package provides a reader / writer interface to bitcoin.

Example:

// ExampleWrite tests that write data to the blockchain works as expected. It
// returns the transaction hash of the reveal transaction.
func ExampleWrite() {
	// Example usage
	fmt.Println("writing...")
	_, err := rollkitbtc.Write([]byte("rollkit-btc: gm"))
	if err != nil {
		fmt.Println(err)
		return
	}
	fmt.Println("done")
	// Output: writing...
	// done
}

// ExampleRead tests that reading data from the blockchain works as expected.
func ExampleRead() {
	// Example usage
	fmt.Println("writing...")
	input := []byte("rollkit-btc: gm")
	hash, err := rollkitbtc.Write(input)
	if err != nil {
		fmt.Println(err)
		return
	}
	fmt.Println("reading...")
	_, err = rollkitbtc.Read(hash)
	if err != nil {
		fmt.Println(err)
		return
	}
	// fmt.Println(expected, got[1:16])
	fmt.Println("done")
	// Output: writing...
	// reading...
	// done
}

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.