{
  "schema_version": "sg_block_ledger_epochs.v1",
  "methodology_version": "1.0.0",
  "datasets": [
    "sg-difficulty-ledger",
    "sg-block-ledger"
  ],
  "observed_at": "2026-10-01T19:55:46Z",
  "through_height": 969431,
  "ledger_from_height": 628992,
  "ledger_through_height": null,
  "ledger_tip_hash": null,
  "sources": {
    "blocks": "https://mempool.space/api/v1/blocks/{height}",
    "header": "https://mempool.space/api/block/{hash}/header",
    "tip": "https://mempool.space/api/blocks/tip/height",
    "second_operator_height": "https://blockstream.info/api/block-height/{height}",
    "second_operator_txids": "https://blockstream.info/api/block/{hash}/txids",
    "second_operator_coinbase": "https://blockstream.info/api/tx/{txid}/hex",
    "pool_rules": "https://github.com/mempool/mining-pools"
  },
  "method": {
    "difficulty": "Each period's nBits is read from the 80-byte header of its first block (height = period x 2,016). Difficulty is computed exactly as 0xffff x 2^208 divided by the target nBits encodes, stored as a reduced fraction, cut (not rounded) to 8 decimals, and beside it Bitcoin Core's own double-precision value written out exactly. The ratio to the previous period is the previous target over this one, from the integers, cut to 10 decimals; the source's rounded ratio is never used.",
    "retarget_rule": "Every retarget's nBits is recomputed by the consensus rule from the previous period's nBits and the times of its first and last blocks (timespan clamped to a quarter and four times two weeks, capped at the proof-of-work limit), and must equal the header's. 2009's unchanged retargets are generated rows like any other.",
    "rewards": "From height 628,992 (the start of the period holding the 2020 halving at 630,000) every block is read: claimed reward is the coinbase outputs (mempool.space extras.reward), fees are extras.totalFees, subsidy is computed from height. Before 628,992 the reward fields are null: not read, never zero. Fee share is fees over claimed reward, cut to 4 decimals. An under-claimed block claims less than subsidy plus fees. An empty block holds only its coinbase.",
    "fees_caveat": "Fees and the under-claimed count rest on one source (mempool.space's totalFees) until the Gazette's own node; reward_over_subsidy_sats (claimed reward minus subsidy) is what the coinbase proofs establish. On-chain only: fees paid out of band to pools are not visible here.",
    "pools": "Pool labels are mempool.space's, assigned from coinbase tags and payout addresses by the public mempool/mining-pools rules, a heuristic, not ownership. mempool.space does not expose which rules commit labelled a block, so each period records the dates its labels were read. Top eight labels by blocks, then every other label, then unknown.",
    "verification": "Every header the ledger reads must double-SHA256 to its block id, link to its parent and meet the target its nBits encodes, and its fields must equal the source's JSON. Each period's first block hash is matched on a second operator, Blockstream's Esplora. The claimed reward is proved on Esplora: its full txid list must rebuild the merkle root in the verified header and match the transaction count, the coinbase is hashed here to its txid, must carry its height (BIP34), and its outputs must sum to the claimed reward. History is sample-verified on that second operator (the retarget block and four random blocks per period, listed in coinbase_proved) until the Gazette's own node; every block added by the daily run is proved in full. Every period in this file states the check of the 15 headers around its retarget.",
    "digest": "rows_sha256 lets a later run prove it read the same blocks with the same source values: d0 is 32 zero bytes and d_i = sha256(d_(i-1) || line_i), where line_i is \"<height> <header hex> <tx_count> <weight> <reward> <totalFees> <pool slug>\\n\" in UTF-8, over the period's blocks in height order.",
    "limitation": "Block data via the mempool.space API and the Blockstream Esplora API, both public operators. Header proof-of-work and coinbase proofs are reproducible from any node with bitcoin-cli getblockheader and getblock.",
    "download": "This file carries the difficulty dataset, sg-difficulty-ledger, only. The reward ledger, sg-block-ledger, is offered as its own file once it reaches the chain tip, so here ledger_through_height, ledger_tip_hash and every period’s ledger are null and coinbase_proved is empty: left out of this file, not zero and not unread. header_check states the retarget-window check the difficulty pass gives every period. For a period the reward ledger has read, every header was checked as well; this file states the weaker check, never a stronger one."
  },
  "periods": [
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    {"epoch":1,"start_height":2016,"end_height":4031,"blocks":2016,"complete":true,"first_block_time":"2009-01-27T13:38:51Z","last_block_time":"2009-02-12T18:58:42Z","retarget_hash":"00000000a141216a896c54f211301c436e557a8d55900637bbdce14c6c7bddef","last_block_hash":"00000000f037ad09d0b05ee66b8c1da83030abaf909d2b1bf519c3c7d2cd3fdf","bits":"1d00ffff","difficulty":{"fraction":"1/1","decimal":"1.00000000","core_float":"1"},"ratio_to_previous":"1.0000000000","subsidy_sats":10080000000000,"ledger":null,"verification":{"header_check":"retarget-window","second_operator_hash":true,"retarget_rule":true,"coinbase_proved":[]}},
    {"epoch":2,"start_height":4032,"end_height":6047,"blocks":2016,"complete":true,"first_block_time":"2009-02-12T19:16:30Z","last_block_time":"2009-03-02T03:44:27Z","retarget_hash":"00000000ca4b69045a03d7b20624def97a5366418648d5005e82fd3b345d20d0","last_block_hash":"000000006ce8b5f16fcedde13acbc9641baa1c67734f177d770a4069c06c9de8","bits":"1d00ffff","difficulty":{"fraction":"1/1","decimal":"1.00000000","core_float":"1"},"ratio_to_previous":"1.0000000000","subsidy_sats":10080000000000,"ledger":null,"verification":{"header_check":"retarget-window","second_operator_hash":true,"retarget_rule":true,"coinbase_proved":[]}},
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