# on receiving a block here
$ date -u '+%Y-%m-%d %H:%M:%SZ'
2024-04-18 16:32:52Z
# as written in the block header
2024-04-18 16:32:47Z

$ uptime   # since last reboot
 16:32:52 up 170 days,  2:49,  0 users,  load average: 1.16, 0.99, 0.97

$ battery.sh
74%, Power Supply Online

$ uname -snrm
Linux singer 6.1.42-0-lts #1-Alpine SMP PREEMPT_DYNAMIC Thu, 27 Jul 2023 12:27:13 +0000 x86_64

$ grep ^MemAvailable /proc/meminfo
MemAvailable:    2107064 kB

$ du -h -d1 .bitcoin/
10.1G	.bitcoin/indexes
1.8G	.bitcoin/signet
12.9M	.bitcoin/wallets
48.9G	.bitcoin/blocks
11.0G	.bitcoin/chainstate
3.4G	.bitcoin/testnet3
75.3G	.bitcoin/

$ df -h .
Filesystem                Size      Used Available Use% Mounted on
/dev/sda3               911.4G    665.4G    245.0G  73% /

$ bitcoind --version
Bitcoin Core version v27.0
Copyright (C) 2009-2024 The Bitcoin Core developers

Please contribute if you find Bitcoin Core useful. Visit
<https://bitcoincore.org/> for further information about the software.
The source code is available from <https://github.com/bitcoin/bitcoin>.

This is experimental software.
Distributed under the MIT software license, see the accompanying file COPYING
or <https://opensource.org/licenses/MIT>

$ BC=$(bitcoin-cli getblockcount); echo $BC
839804

$ BH=$(bitcoin-cli getblockhash 839804); echo $BH
00000000000000000000920bf30e249d415a4f164b1ffb4b84c928c2a2155fc2

$ bitcoin-cli getblockheader $BH
{
  "hash": "00000000000000000000920bf30e249d415a4f164b1ffb4b84c928c2a2155fc2",
  "confirmations": 1,
  "height": 839804,
  "version": 567222272,
  "versionHex": "21cf2000",
  "merkleroot": "1ad97e5dcfe9c36531f4cbb8655d58c2b128e4a49015357456b56df4e672ecf4",
  "time": 1713457967,
  "mediantime": 1713455421,
  "nonce": 1481362962,
  "bits": "17034219",
  "difficulty": 86388558925171.02,
  "chainwork": "000000000000000000000000000000000000000074ffb2bf94e3ad4352c328bf",
  "nTx": 2433,
  "previousblockhash": "0000000000000000000287318ec195ed4043c027fc4283a20ca362119b01f5f9"
}

$ echo $BH | tr 0 . | fold -w 4 | paste -d " " - - - -
.... .... .... ....
.... 92.b f3.e 249d
415a 4f16 4b1f fb4b
84c9 28c2 a215 5fc2

$ : Following is the shortform
$ last=${BH#${BH%????}}
$ a=$(echo $BH | cut -b-60 \
  | fold -w 4 \
  | grep -Ev '^(0000|[^0]{4})$')
$ R=$(echo $a $last | cut -b-20)
$ printf "%s: " $BC
$ { echo $R | grep "$last$" \
  || echo $R M; } | tr "0\n" ". "
  echo
839804: 92.b f3.e 5fc2 

$ : Following is the shortkode
$ last=${BH#${BH%????}}
$ nz=$(echo $BH | fold -w 4 \
  | grep -cE '^[^0]{4}$')
$ z=$(echo $BH | fold -w 4 \
  | grep -c '^0000$')
$ printf "%s sk: " $BC
$ printf "%s %x" $last \
  $(((${nz}<<4)+${z})) \
  | tr "0\n" ". "; echo
839804 sk: 5fc2 95

$ niceblack.sh $BH $BC
         |    |          |   
          _ \ |  _ \  _| | / 
        _.__/_|\___/\__|_\_\ 

      _ )__ /  _ \ _ )   \  | |  
      _ \ _ \\_  / _ \ (  |__ _| 
    \___/___/  _/\___/\__/   _|  

  ,---   .123 4567 89ab cdef   ---,
  | ..   .... .... .... ....   .f |
  | 1.   .... 92.b f3.e 249d   1f |
  | 2.   415a 4f16 4b1f fb4b   2f |
  | 3.   84c9 28c2 a215 5fc2   3f |
  '===   ==== ==== ==== ====   ==='
   sf:   92.b f3.e 5fc2 
   sk:   5fc2 95
  ................ |..|..|.....|.||

$ bitcoin-cli getmempoolinfo
{
  "loaded": true,
  "size": 69619,
  "bytes": 79186838,
  "usage": 291179344,
  "total_fee": 9.90851071,
  "maxmempool": 300000000,
  "mempoolminfee": 0.00001000,
  "minrelaytxfee": 0.00001000,
  "incrementalrelayfee": 0.00001000,
  "unbroadcastcount": 0,
  "fullrbf": true
}

# current and previous two
$ bitcoin-cli getnetworkhashps -1
6.319980281202273e+20

$ bitcoin-cli getnetworkhashps -1 838655
6.182828247491896e+20

$ bitcoin-cli getnetworkhashps -1 836639
5.948660332273082e+20

$ bitcoin-cli gettxoutsetinfo muhash
{
  "height": 839804,
  "bestblock": "00000000000000000000920bf30e249d415a4f164b1ffb4b84c928c2a2155fc2",
  "txouts": 176247462,
  "bogosize": 13523532944,
  "muhash": "f5f470bdd507444348a982e967e5bdf9e5e2f1215a0781efc9a49a9017d3d63a",
  "total_amount": 19686061.74273123,
  "total_unspendable_amount": 219.50726877,
  "block_info": {
    "prevout_spent": 6162.64976762,
    "coinbase": 7.33635821,
    "new_outputs_ex_coinbase": 6161.56340941,
    "unspendable": 0.00000000,
    "unspendables": {
      "genesis_block": 0.00000000,
      "bip30": 0.00000000,
      "scripts": 0.00000000,
      "unclaimed_rewards": 0.00000000
    }
  }
}

$ bitcoin-cli getnettotals
{
  "totalbytesrecv": 66470449,
  "totalbytessent": 94783935,
  "timemillis": 1713457972553,
  "uploadtarget": {
    "timeframe": 86400,
    "target": 0,
    "target_reached": false,
    "serve_historical_blocks": true,
    "bytes_left_in_cycle": 0,
    "time_left_in_cycle": 0
  }
}

$ bitcoin-cli -netinfo
Bitcoin Core client v27.0 - server 70016/Satoshi:27.0.0/

         ipv4   onion     npr   total   block  manual
in         53       0       2      55
out         5       6       0      11       2       1
total      58       6       2      66

Local addresses
176.112.185.89                                                     port   8333    score    217
gifm4fnj3vua664xhgeanx5fnpco3txkqy4amr4txbfsciiyrkxpf2qd.onion     port   8333    score      4

$ bitcoin-cli -addrinfo
{
  "addresses_known": {
    "ipv4": 54291,
    "ipv6": 9,
    "onion": 15318,
    "i2p": 0,
    "cjdns": 0,
    "total": 69618
  }
}

$ halving.sh 839804
=====================================
  Bitcoin Block Halving prediction
=====================================

bc=839804
gbt=1231006505
bbt=1713457967

This is average time to mine a block
(1713457967-1231006505)/839804
bts=574.4810241437287748093602

Now let's multiply that by 840000
which is the block number of next
halving and get the prediction:
Fri Apr 19 23:49:25 UTC 2024

-------------------------------------
Next palindrome will be 839938
predicted to happen at this time:
Fri Apr 19 13:55:47 UTC 2024

-------------------------------------
Current mining epoch number is 416.
The next fortnight happens in block
840672 and probably around this time:
Wed Apr 24 11:03:36 UTC 2024

### v2_peerinfo are in v2_peerinfo-bitcoin.txt