Timeline

Every entry has a date and a source. Bitcoin's own milestones are given at the height Blockspace Holdings' BTI records for them, dated by that block's header time (UTC) as https://explore.block.space reports it.

1. 2009-01-03 The genesis block, block 0, is mined. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs
2. 2012-11-28 The first halving, at block 210,000: the block subsidy falls from 50 to 25 BTC. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs
3. 2013-03-29 The first OP_RETURN output on Bitcoin appears at block 228,596, a year before Bitcoin Core 0.9 made it standard. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs
4. 2013-07-31 Mastercoin, later Omni, opens its Exodus fundraiser at block 249,498. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs
5. 2014-01-02 Counterparty's proof-of-burn begins at block 278,310. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs
6. 2016-07-09 The second halving, at block 420,000. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs
7. 2017-08-24 SegWit activates at block 481,824, and with it the witness discount. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs, Blockspace Value Theory
8. 2020-05-11 The third halving, at block 630,000. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs
9. 2021-11-14 Taproot activates at block 709,632, which makes the inscription envelope possible. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs
10. 2022-12-14 Inscription #0 is made at block 767,430, the first ordinal inscription. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs, block.space protocols API
11. 2023-01-31 The first cursed inscription, inscription -1, appears at block 774,411. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs
12. 2023-03-08 BRC-20 begins with the ordi deploy inscription at block 779,832. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs, block.space protocols API
13. 2023-04-08 Inscription #1,000,000 is made, at block 784,528. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs
14. 2023-05-03 KEVIN, the first SRC-20 token, is deployed at block 788,041. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs, block.space protocols API
15. 2023-09-17 Atomicals and ARC-20 begin at block 808,080. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs
16. 2024-01-06 ord's Jubilee at block 824,544, when cursed inscriptions are blessed. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs
17. 2024-04-20 The fourth halving and the launch of Runes, at block 840,000. Rune #0 is UNCOMMON•GOODS. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs, Blockspace Value Theory, block.space protocols API
18. 2024-11-27 The Bitbar minting app behind mintbitbars.xyz is first written. Source: Blockspace Holdings records, The mintbitbars.xyz checkout (antron3000/Bitbar-Minting-App): index.html, server/, minter/
19. 2025-01-20 Alkanes activates at block 880,000; its first message runs four blocks later, at 880,004. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs, block.space protocols API
20. 2025-06-20 Counterparty v11 taproot envelopes become mandatory at block 902,000. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs, Blockspace Value Theory
21. 2025-06-20 Bitcoin Counters begins: counter #0 (XDUALS) at block 902,005. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs, Bitcoin Counters v3, indexer and wallet: README (BitcoinCounters/counters)
22. 2025-07-14 Inscription #100,000,000 is made, at block 905,492. Source: Blockspace Holdings records, explore.block.space REST API, read-only GETs
23. 2026-06-25 Work begins on the Bitcoin Counters indexer and wallet, the index behind counters.gallery. Source: Blockspace Holdings records, Bitcoin Counters v3, indexer and wallet: README (BitcoinCounters/counters)
24. 2026-08-02 The Meter becomes block.space's main page, with its own explorer of transactions and bytes beside it. Source: Blockspace Holdings records
25. 2026-08-02 Blockspace Value Theory, the Shared Claim Axiom and the BTP and BYTES drafts get a version history. Source: Blockspace Holdings records, Blockspace Value Theory
26. 2026-08-06 BTI is designed from first principles (draft 0.2), with Ruleset v1 and the three books, A, B and C. Source: Blockspace Holdings records
27. 2026-08-10 BTI is rebuilt: the T1 and T2 engine, 22 adapters and the token table, with one adapter per metaprotocol indexer. Source: Blockspace Holdings records
28. 2026-08-11 block.space runs on the rebuilt BTI. Source: Blockspace Holdings records
29. 2026-09-07 Work begins on counters.fun, Counters with XCP liquidity pools. Source: Blockspace Holdings records, counters.fun README (BitcoinCounters/counters.fun)
30. 2026-09-23 Work begins on the degent.club site and mint. Source: Blockspace Holdings records
31. 2026-10-18 block.space publishes the leaderboard: every address ranked by the blockspace its tokens are backed by. Source: Blockspace Holdings records, block.space leaderboard API
32. 2026-10-18 block.space publishes /largest-inscriptions, the largest inscriptions in order. Source: Blockspace Holdings records
33. 2026-10-18 block.space publishes /heaviest-tokens, the heaviest tokens in order, family by family. Source: Blockspace Holdings records
34. 2026-10-19 The appendix of holders is filled: 125,438,419 sats and 4,460,161 addresses, with 85.7 % of Book A on addresses; from then on it is updated block by block. Source: Blockspace Holdings records
35. 2026-10-19 /largest-inscriptions ranks each inscription, and /heaviest-tokens ranks tokens 100,000 deep per protocol. Source: Blockspace Holdings records
36. 2026-10-19 The three rankings share one frame, and block.space publishes its rankings docs. Source: Blockspace Holdings records, block.space docs: rankings
37. 2026-10-19 block.space adopts the five-colour family key: five families, then Other. Source: Blockspace Holdings records
38. 2026-10-19 The sat family is named Ordinal Sats. Source: Blockspace Holdings records
39. 2026-10-19 /largest-inscriptions becomes a grid of squares, each showing the inscription's own content. Source: Blockspace Holdings records
40. 2026-10-19 block.space/projects lists every project, one per domain. Source: Blockspace Holdings records, The project list at block.space/projects
41. 2026-10-19 blockspace.holdings is live at its own address. Source: The project list at block.space/projects, Blockspace Holdings records
42. 2026-10-19 degent.club is live again at its own address. Source: The project list at block.space/projects
43. 2026-10-19 spaceblocks.art is live: one image that fills a 1 MB block. Source: The project list at block.space/projects, Blockspace Holdings records
44. 2026-10-19 blockspace.news is live, with a daily edition in numbers from block.space. Source: The project list at block.space/projects, Blockspace Holdings records
45. 2026-10-19 blockspace.markets is live: blockspace for sale, priced per kilobyte. Source: The project list at block.space/projects, Blockspace Holdings records
46. 2026-10-19 mintbitbars.xyz is live. Source: The project list at block.space/projects, Blockspace Holdings records
47. 2026-10-20 blockspacelabs.com goes live with its research cards. Source: The project list at block.space/projects, Blockspace Holdings records, The blockspacelabs.com page (index.html)
48. 2026-10-20 blockspace.to, the spent-sats ord explorer, goes live. Source: The project list at block.space/projects, The blockspacelabs.com page (index.html)
49. 2026-10-20 litepedia.space answers at its own address, Coming soon. Source: The project list at block.space/projects, Blockspace Holdings records
50. 2026-10-20 Scribbit gets its descriptive site; scribb.it is Coming soon. Source: Blockspace Holdings records, The project list at block.space/projects
51. 2026-10-20 block.space publishes /collections: NFT collections on Bitcoin, ranked by blockspace. Source: Blockspace Holdings records
52. 2026-10-20 The leaderboard's bars and key run largest family first. Source: Blockspace Holdings records
53. 2026-10-20 blockspace.wiki is built. Source: Blockspace Holdings records, blockspace.wiki README

Sources #

1. The project list at block.space/projects · block.space/projects
2. explore.block.space REST API, read-only GETs · explore.block.space/api/blocks/tip/height
3. Blockspace Value Theory · block.space/docs/bvt
4. block.space protocols API · block.space/api/protocols
5. Bitcoin Counters v3, indexer and wallet: README (BitcoinCounters/counters) · github.com/BitcoinCounters/counters
6. The mintbitbars.xyz checkout (antron3000/Bitbar-Minting-App): index.html, server/, minter/ · github.com/antron3000/Bitbar-Minting-App
7. counters.fun README (BitcoinCounters/counters.fun) · github.com/BitcoinCounters/counters.fun
8. block.space leaderboard API · block.space/api/leaderboard
9. block.space docs: rankings · block.space/docs/rankings
10. The blockspacelabs.com page (index.html) · blockspacelabs.com
11. blockspace.wiki README · blockspace.wiki
12. Blockspace Holdings records