8MB - blocks containing string "8M" in their coinbase scriptSig (i.e. miners supporting block size increase to 8MB citation needed ) BIP100 - blocks containing string "BV" + some digits in their coinbase scriptSig that is BIP100 (and others based on it), also includes blocks with string "BIP100" in coinbase BIP101 - blocks with version 0x20000007 as defined in BIP101 None - blocks mined without an