---------- Forwarded message --------- From: William Casarin Date: Wed, Jun 5, 2019 at 9:13 AM Subject: [ots-dev] miniOTS: ots proofs that fit in a tweet To: Hello OTS people, Following from my previous post about cleartext OTS proof sharing[1], I've been working on a new OTS format called miniOTS, which is minimal/compressed format that allows attestations to fit in a tweet[2] and for other space constrained contexts. Just stripping out additional attestations in the standard format only gets it down to just above ~280 bytes when base58 encoded, which is too much for a tweet, so I decided to roll a custom format that is a bit more efficient with attestation and op tags. The goal was to have small enoughs proofs that I could reply to a tweet with the stamp of the previous message, instead of relying on external sites such as @otsproofbot Current format (210 bytes, 288 bytes base58-encoded): 00000000: 004f 7065 6e54 696d 6573 7461 6d70 7300 .OpenTimestamps. 00000010: 0050 726f 6f66 00bf 89e2 e884 e892 9401 .Proof.......... 00000020: 08cb 2d4a f572 8d44 a5b0 7c7b f1ff 78a9 ..-J.r.D..|{..x. 00000030: 1818 7270 13f1 9bbd f4b0 344b 9e93 0c6b ..rp......4K...k 00000040: 39f0 1020 34fe cad9 edef bab0 3420 e4ee 9.. 4.......4 .. 00000050: d3a7 c608 fff0 107c 31f7 da6c dbf2 3271 .......|1..l..2q 00000060: 904c c5dd f58d eb08 f120 e4f7 3eaf a747 .L....... ..>..G 00000070: 324a f096 1aa0 928d e1c1 91bf 3c38 237d 2J..........<8#} 00000080: d412 c1c0 e94c d4ae 3f76 08f1 045c 4cb3 .....L..?v...\L. 00000090: a4f0 08f7 834d 4b14 68fd 41ff 0083 dfe3 .....MK.h.A..... 000000a0: 0d2e f90c 8e2c 2b68 7474 7073 3a2f 2f62 .....,+https://b 000000b0: 6f62 2e62 7463 2e63 616c 656e 6461 722e ob.btc.calendar. 000000c0: 6f70 656e 7469 6d65 7374 616d 7073 2e6f opentimestamps.o 000000d0: 7267 rg miniOTS format (133 bytes, 183 bytes base58-encoded): 00000000: 6f74 7301 8a20 34fe cad9 edef bab0 3420 ots.. 4.......4 00000010: e4ee d3a7 c683 8a7c 31f7 da6c dbf2 3271 .......|1..l..2q 00000020: 904c c5dd f58d eb83 8be4 f73e afa7 4732 .L.........>..G2 00000030: 4af0 961a a092 8de1 c191 bf3c 3823 7dd4 J..........<8#}. 00000040: 12c1 c0e9 4cd4 ae3f 7683 8b5c 4cb3 a48a ....L..?v..\L... 00000050: f783 4d4b 1468 fd41 9a2b 6874 7470 733a ..MK.h.A.+https: 00000060: 2f2f 626f 622e 6274 632e 6361 6c65 6e64 //bob.btc.calend 00000070: 6172 2e6f 7065 6e74 696d 6573 7461 6d70 ar.opentimestamp 00000080: 732e 6f72 67 s.org base58 before: 12j6JNmon36jC1MMcpvC8nHqg5p8DAT2mmPQ5aLaBmAbk8naEVt8HFVohRqkuMXZF2Wo2n9kv 5ByeL17yUww4NHuFyCT6PXsGxRuEZ12Z33gsLbXL5FuFmnvMLd3tzf76n69J7qxLPxmoAgm1z 9NEMi2MRypDNKy1GypGN5NLwerzy1nU5g5dZxV6TZ5rBs4gYqnMNJn9VMkfKeDSZ9M8aoMWrL ShokXUpnS1qrqkTvTwyKMx17fhKfcP9FyhNkb81t8dwYLtBsN4QuP9UAktMUvjEoBzHt base58 after: 6gQjQUehytgUevKLRtAFYbC6UJX72LCDgVWxAUPsCt3tqEVTEQfmUB1T1Y1GTyY8sugiPY97K gWRPPXYJmH3J5jqVtyNLrzdkySM6VAYDVckya9BxbUbFB8Gs4U3LHEauTmgCPEhGhiRdC3eFW 63SwfAvKB8Q8Ku8ZM9uASCwWZ8K2AoVabuAn You can check it out here: git clone https://git.sr.ht/~jb55/ots-tool This is still a work in progress, I haven't built the miniOTS -> OTS decoder yet. make ./otsmini file.ots Cheers, Will [1] id:878t1fzn0v.fsf@jb55.com [2] https://twitter.com/jb55/status/1136260220521336832 -- - Bryan http://heybryan.org/ 1 512 203 0507