{
    "meta": {
        "title": "D-Central — Bitcoin Pool Centralization Tracker",
        "description": "Bitcoin mining-pool hashrate concentration by time window: pool count, Nakamoto coefficient (fewest pools to exceed 50% of blocks), HHI, and top-1 / top-3 pool share — plus the current per-pool share table.",
        "generated": "2026-06-19T04:32:09+00:00",
        "version": "1.0",
        "license": "https://creativecommons.org/licenses/by/4.0/",
        "license_name": "CC BY 4.0",
        "source": "https://d-central.tech/bitcoin-pool-centralization/",
        "method": "Shares from block attribution (mempool.space). Nakamoto = fewest pools whose cumulative share exceeds 50%. HHI = sum of squared percentage shares (0-10000; US DOJ: <1500 unconcentrated, 1500-2500 moderate, >2500 high).",
        "disclaimer": "Pool attribution is a proxy for hashrate based on identified coinbase tags; unidentified blocks and pool-hopping add noise. A point-in-time snapshot, refreshed every 6 hours."
    },
    "windows": [
        {
            "window": "1w",
            "blocks": 1030,
            "pool_count": 18,
            "nakamoto": 3,
            "hhi": 1478,
            "top1_share": 25.60000000000000142108547152020037174224853515625,
            "top3_share": 57.60000000000000142108547152020037174224853515625
        },
        {
            "window": "1m",
            "blocks": 4321,
            "pool_count": 23,
            "nakamoto": 3,
            "hhi": 1491,
            "top1_share": 27.10000000000000142108547152020037174224853515625,
            "top3_share": 58
        },
        {
            "window": "3m",
            "blocks": 13107,
            "pool_count": 28,
            "nakamoto": 3,
            "hhi": 1573,
            "top1_share": 29.699999999999999289457264239899814128875732421875,
            "top3_share": 58.7999999999999971578290569595992565155029296875
        },
        {
            "window": "1y",
            "blocks": 52497,
            "pool_count": 33,
            "nakamoto": 3,
            "hhi": 1552,
            "top1_share": 29.300000000000000710542735760100185871124267578125,
            "top3_share": 58.10000000000000142108547152020037174224853515625
        }
    ],
    "current_pools": [
        {
            "name": "Foundry USA",
            "blocks": 1173,
            "share_pct": 27.14999999999999857891452847979962825775146484375
        },
        {
            "name": "AntPool",
            "blocks": 820,
            "share_pct": 18.980000000000000426325641456060111522674560546875
        },
        {
            "name": "F2Pool",
            "blocks": 513,
            "share_pct": 11.8699999999999992184029906638897955417633056640625
        },
        {
            "name": "SpiderPool",
            "blocks": 447,
            "share_pct": 10.339999999999999857891452847979962825775146484375
        },
        {
            "name": "ViaBTC",
            "blocks": 358,
            "share_pct": 8.28999999999999914734871708787977695465087890625
        },
        {
            "name": "MARA Pool",
            "blocks": 237,
            "share_pct": 5.480000000000000426325641456060111522674560546875
        },
        {
            "name": "SECPOOL",
            "blocks": 179,
            "share_pct": 4.13999999999999968025576890795491635799407958984375
        },
        {
            "name": "Luxor",
            "blocks": 146,
            "share_pct": 3.37999999999999989341858963598497211933135986328125
        },
        {
            "name": "OCEAN",
            "blocks": 125,
            "share_pct": 2.890000000000000124344978758017532527446746826171875
        },
        {
            "name": "SBI Crypto",
            "blocks": 94,
            "share_pct": 2.180000000000000159872115546022541821002960205078125
        },
        {
            "name": "Binance Pool",
            "blocks": 64,
            "share_pct": 1.479999999999999982236431605997495353221893310546875
        },
        {
            "name": "Braiins Pool",
            "blocks": 63,
            "share_pct": 1.45999999999999996447286321199499070644378662109375
        },
        {
            "name": "Unknown",
            "blocks": 37,
            "share_pct": 0.85999999999999998667732370449812151491641998291015625
        },
        {
            "name": "ULTIMUSPOOL",
            "blocks": 22,
            "share_pct": 0.5100000000000000088817841970012523233890533447265625
        },
        {
            "name": "BTC.com",
            "blocks": 15,
            "share_pct": 0.34999999999999997779553950749686919152736663818359375
        },
        {
            "name": "Poolin",
            "blocks": 9,
            "share_pct": 0.2099999999999999922284388276239042170345783233642578125
        },
        {
            "name": "Innopolis Tech",
            "blocks": 7,
            "share_pct": 0.1600000000000000033306690738754696212708950042724609375
        },
        {
            "name": "NiceHash",
            "blocks": 4,
            "share_pct": 0.0899999999999999966693309261245303787291049957275390625
        },
        {
            "name": "WhitePool",
            "blocks": 3,
            "share_pct": 0.070000000000000006661338147750939242541790008544921875
        },
        {
            "name": "RedRock Pool",
            "blocks": 3,
            "share_pct": 0.070000000000000006661338147750939242541790008544921875
        }
    ]
}