PSA: Potential Bitcoin PoW change Sunday. SHA2 miners should stop mining Saturday. - nostr:nprofile1qqsg3mj8tuxhxvy5w0qt9altpgcrqttdfxg9glvsdfhkpa3plcxfudgpzpmhxue69uhkummnw3ezumt0d5hszrnhwden5te0deh...