{
  "name": "ERC-8004 IdentityRegistry census \u2014 Ethereum, Base, Arbitrum, BSC \u2014 2026-09-17",
  "checkpoint_utc": "2026-09-17T04:31Z",
  "chains": {
    "ethereum": {
      "chain": "ethereum",
      "registry_address": "0x8004A169FB4a3325136EB29fA0ceB6D2e539a432",
      "method": "full_rescan",
      "window_start_block": 24339871,
      "window_end_block": 25994481,
      "window_start_utc": "2026-01-29T10:20:23Z",
      "window_end_utc": "2026-09-17T03:20:47Z",
      "registrations": 50820,
      "distinct_senders": 11352,
      "distinct_senders_is_lower_bound": false,
      "top1_share": 0.049193,
      "top10_share": 0.182487,
      "top1_share_ci95_low": null,
      "top1_share_ci95_high": null,
      "top10_share_ci95_low": null,
      "top10_share_ci95_high": null,
      "hhi": null,
      "sample_seed": null,
      "n_resolved": 50820,
      "notes": ""
    },
    "base": {
      "chain": "base",
      "registry_address": "0x8004A169FB4a3325136EB29fA0ceB6D2e539a432",
      "method": "full_rescan",
      "window_start_block": 41663783,
      "window_end_block": 51415064,
      "window_start_utc": "2026-02-03T11:08:33Z",
      "window_end_utc": "2026-09-17T04:31:15Z",
      "registrations": 88500,
      "distinct_senders": 29289,
      "distinct_senders_is_lower_bound": false,
      "top1_share": 0.115831,
      "top10_share": 0.272124,
      "top1_share_ci95_low": null,
      "top1_share_ci95_high": null,
      "top10_share_ci95_low": null,
      "top10_share_ci95_high": null,
      "hhi": null,
      "sample_seed": null,
      "n_resolved": 88500,
      "notes": ""
    },
    "arbitrum": {
      "chain": "arbitrum",
      "registry_address": "0x8004A169FB4a3325136EB29fA0ceB6D2e539a432",
      "method": "full_rescan",
      "window_start_block": 428895443,
      "window_end_block": 505982474,
      "window_start_utc": "2026-02-05T13:16:00Z",
      "window_end_utc": "2026-09-17T04:31:28Z",
      "registrations": 1502,
      "distinct_senders": 142,
      "distinct_senders_is_lower_bound": false,
      "top1_share": 0.181758,
      "top10_share": 0.391478,
      "top1_share_ci95_low": null,
      "top1_share_ci95_high": null,
      "top10_share_ci95_low": null,
      "top10_share_ci95_high": null,
      "hhi": null,
      "sample_seed": null,
      "n_resolved": 1502,
      "notes": "small_n_caveat"
    },
    "bnb_standard": {
      "chain": "bnb_standard",
      "registry_address": "0x8004A169FB4a3325136EB29fA0ceB6D2e539a432",
      "method": "full_raw_count_backfill",
      "window_start_block": 79027268,
      "window_end_block": 122349961,
      "window_start_utc": "",
      "window_end_utc": "",
      "registrations": 352415,
      "distinct_senders": 1289,
      "distinct_senders_is_lower_bound": true,
      "top1_share": 0.096667,
      "top10_share": 0.142,
      "top1_share_ci95_low": 0.082726,
      "top1_share_ci95_high": 0.112668,
      "top10_share_ci95_low": 0.125249,
      "top10_share_ci95_high": 0.16058,
      "hhi": 0.010379,
      "sample_seed": 659,
      "n_resolved": 1500,
      "notes": "early_era_only;cluster_sample_uniform_tuple;raw_count_is_whole_history"
    },
    "bnb_standard_late": {
      "chain": "bnb_standard_late",
      "registry_address": "0x8004A169FB4a3325136EB29fA0ceB6D2e539a432",
      "method": "cluster_sample_windowed",
      "window_start_block": 104927268,
      "window_end_block": 122384655,
      "window_start_utc": "",
      "window_end_utc": "",
      "registrations": 1592,
      "distinct_senders": 1117,
      "distinct_senders_is_lower_bound": true,
      "top1_share": 0.0025,
      "top10_share": 0.025,
      "top1_share_ci95_low": 0.000851,
      "top1_share_ci95_high": 0.007325,
      "top10_share_ci95_low": 0.017567,
      "top10_share_ci95_high": 0.035465,
      "hhi": 0.000963,
      "sample_seed": 660,
      "n_resolved": 1200,
      "notes": "late_era_only;cluster_sample_windowed"
    },
    "bnb_brc8004_fork": {
      "chain": "bnb_brc8004_fork",
      "registry_address": "0xfA09B3397fAC75424422C4D28b1729E3D4f659D7",
      "method": "cluster_sample_windowed",
      "window_start_block": 78864633,
      "window_end_block": 122424322,
      "window_start_utc": "",
      "window_end_utc": "",
      "registrations": 0,
      "distinct_senders": 0,
      "distinct_senders_is_lower_bound": true,
      "top1_share": 0.0,
      "top10_share": 0.0,
      "top1_share_ci95_low": 0.0,
      "top1_share_ci95_high": 0.0,
      "top10_share_ci95_low": 0.0,
      "top10_share_ci95_high": 0.0,
      "hhi": null,
      "sample_seed": 661,
      "n_resolved": 0,
      "notes": "fork_effectively_empty"
    }
  },
  "attribution": {
    "publisher": "Onchain Agent Intel",
    "canonical_url": "https://onchainagentintel.io/data/erc-8004-four-chain-census-2026-09",
    "license": "https://creativecommons.org/licenses/by/4.0/",
    "cite_as": "Onchain Agent Intel (2026). ERC-8004 IdentityRegistry census across Ethereum, Base, Arbitrum One, and BNB Smart Chain (2026-09-17). CC BY 4.0. https://onchainagentintel.io/data/erc-8004-four-chain-census-2026-09"
  },
  "offer": {
    "description": "Live per-agent trust + endpoint intel beyond this snapshot.",
    "payable_endpoint": "https://api.onchainagentintel.io/v1/intel/agent/{token_id}?chain={chain}",
    "payment_scheme": "x402",
    "payment_discovery": "https://onchainagentintel.io/.well-known/x402.json",
    "human_portal": "https://onchainagentintel.io/app/pricing"
  }
}