You will be able to mine 42 solo, but the block reward is 0 coin + tx Fees. So, the only real way to get 42 will be to swap the old coins for the new ones.
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getrawtransaction a251ce996f31fbf692c7ef6954c6c7a7e428b5a5890f93a28a7ecce0d6e29378

010000002deb2b58010000000000000000000000000000000000000000000000000000000000000000ffffffff0c02a40101350372ea00000057ffffffff0180969800000000001976a914b149c7946b5b3f09242a56d139934fcc81db2aca88ac00000000

decoderawtransaction 010000002deb2b58010000000000000000000000000000000000000000000000000000000000000000ffffffff0c02a40101350372ea00000057ffffffff0180969800000000001976a914b149c7946b5b3f09242a56d139934fcc81db2aca88ac00000000

{
"txid" : "a251ce996f31fbf692c7ef6954c6c7a7e428b5a5890f93a28a7ecce0d6e29378",
"version" : 1,
"time" : 1479273261,
"locktime" : 0,
"vin" : [
{
"coinbase" : "02a40101350372ea00000057",
"sequence" : 4294967295
}
],
"vout" : [
{
"value" : 0.10000000,
"n" : 0,
"scriptPubKey" : {
"asm" : "OP_DUP OP_HASH160 b149c7946b5b3f09242a56d139934fcc81db2aca OP_EQUALVERIFY OP_CHECKSIG",
"hex" : "76a914b149c7946b5b3f09242a56d139934fcc81db2aca88ac",
"reqSigs" : 1,
"type" : "pubkeyhash",
"addresses" : [
"4VsEs7wqRpoiTpmqViWRtse1P3CNgvBw4g"
]
}
}
]
}
{
"hash" : "000004cf6cc5eec2d2d564fa45c26278ed72014822a601c1ff02cd84d0ef63be",
"confirmations" : 240,
"size" : 217,
"height" : 0,
"version" : 1,
"merkleroot" : "8595bda86b1eb5c8b1830bf4c391c6d2b66adc688caf00795fbb8a5bbb0f94ce",
"mint" : 0.00000000,
"time" : 1478980800,
"nonce" : 1031066,
"bits" : "1e0fffff",
"difficulty" : 0.00024414,
"blocktrust" : "1",
"chaintrust" : "1",
"nextblockhash" : "0000004a0c482c8f56397d0058df8d84d0ad0f7f896af1345b033325bf7f4969",
"flags" : "proof-of-work stake-modifier",
"proofhash" : "000004cf6cc5eec2d2d564fa45c26278ed72014822a601c1ff02cd84d0ef63be",
"entropybit" : 0,
"modifier" : "0000000000000000",
"modifierchecksum" : "fd11f4e7",
"tx" : [
"8595bda86b1eb5c8b1830bf4c391c6d2b66adc688caf00795fbb8a5bbb0f94ce"
]
}