user75102: As it is understood that arriving nonce is very resource intensive, whether "Digital Signature of the Block by the Miner" can be considered in place of "Nonce"? Its Shortcomings, if not suitable.

user5757: This only raises the question of which miners' signatures are considered acceptable.  If anyone can be a miner and provide a signature, then there is no security and no way to objectively determine which of many conflicting blocks is authoritative.  If there is a fixed list of authorized public keys, then the currency is no longer decentralized.

75102: <p>As it is understood that arriving nonce is very resource intensive, whether "Digital Signature of the Block by the Miner" can be considered in place of "Nonce"? Its Shortcomings, if not suitable.</p>
 5757: <p>This only raises the question of which miners' signatures are considered acceptable.  If anyone can be a miner and provide a signature, then there is no security and no way to objectively determine which of many conflicting blocks is authoritative.  If there is a fixed list of authorized public keys, then the currency is no longer decentralized.</p>
