Function gossmap_guess_node_id

common/gossmap.c:1295–1307

There are two 33-byte pubkeys possible: choose the one which appears * in the graph (otherwise payment will fail anyway). */

/* There are two 33-byte pubkeys possible: choose the one which appears
 * in the graph (otherwise payment will fail anyway). */
void gossmap_guess_node_id(const struct gossmap *map,
			   const struct point32 *point32,
			   struct node_id *id)
{
	id->k[0] = SECP256K1_TAG_PUBKEY_EVEN;
	secp256k1_xonly_pubkey_serialize(secp256k1_ctx,
					 id->k + 1,
					 &point32->pubkey);

	/* If we don't find this, let's assume it's odd. */
	if (!gossmap_find_node(map, id))
		id->k[0] = SECP256K1_TAG_PUBKEY_ODD;
}