1) Comments are enabled as a service by blockchain.info. For details on how the Genesis Block (and comment by Satoshi) was formed, look at the Bitcoin Wiki[1]
2) Coins are being sent. The Developer page says you must send at least 0.00000001 BTC. Edit: actually 500000 Satoshi.
3) Agree. So does the service. See the Developer Page[2]
5460 satoshis is the current default minimum that Bitcoin itself allows (other transactions are valid, but won't be forwarded, thus you need to hand it over to a miner yourself for inclusion in a block).
Comments
1) Comments are enabled as a service by blockchain.info. For details on how the Genesis Block (and comment by Satoshi) was formed, look at the Bitcoin Wiki[1]
2) Coins are being sent. The Developer page says you must send at least 0.00000001 BTC. Edit: actually 500000 Satoshi.
3) Agree. So does the service. See the Developer Page[2]
[1] https://en.bitcoin.it/wiki/Genesis_block
[2] http://www.proofofexistence.com/developers
5460 satoshis is the current default minimum that Bitcoin itself allows (other transactions are valid, but won't be forwarded, thus you need to hand it over to a miner yourself for inclusion in a block).