// don't trust. verify.
Your moment,
written in the timechain.
blockmemento templates
5 templates · same block, same proof, your style
template classicThe block, decoded: height, hash, the 80-byte header, the chain, the figures.
template momentYour words first. The block becomes a seal. The gift choice.
template proofMonospace, black, the hash on an 8 × 8 grid. For the cypherpunk.
template hash-artThe 256 bits of the hash as a grid. The zeros are the proof of work.
template timechainYour block among its neighbours, with its confirmations.
blockmemento why
every value is read from our own bitcoin full node. the header is hashed again before printing. the command to check it is printed at the bottom of every poster. pay in sats through our own BTCPay Server: no custodian, no account.
$ bitcoin-cli getblockhash 100000
000000000003ba27aa200b1cecaad478d2b00432346c3f1f3986da1afd33e506
$ bitcoin-cli getblockheader <hash> false
0100000050120119172a610421a6c3011dd330d9df07b63616c2cc1f1cd00200000000006657a9252aacd5c0b2940996ecff952228c3067cc38d4885efb5a4ac4247e9f337221b4d4c86041b0f2b5710blockmemento famous
| height | date (UTC) | what | use |
|---|---|---|---|
| 0 | 2009-01-03 | the genesis block | see on chainuse |
| 57043 | 2010-05-22 | bitcoin pizza day | see on chainuse |
| 100000 | 2010-12-29 | block one hundred thousand | see on chainuse |
| 210000 | 2012-11-28 | the first halving | see on chainuse |
| 420000 | 2016-07-09 | the second halving | see on chainuse |
| 481824 | 2017-08-24 | segwit activates | see on chainuse |
| 630000 | 2020-05-11 | the third halving | see on chainuse |
| 709632 | 2021-11-14 | taproot activates | see on chainuse |
| 840000 | 2024-04-20 | the fourth halving | see on chainuse |
man blockmemento
- which block do I get for a date?
- the first block mined after your moment, in UTC. the preview shows it before you pay.
- why not a very recent moment?
- we wait for six confirmations, about an hour, so your block can never change.
- can I pay in bitcoin?
- yes, on-chain or over Lightning, through our own BTCPay Server. card works too.
- can I get just the file?
- yes. the vector PDF prints sharp at any size.