# Hive Developer Portal

### Understanding Dynamic Global Properties

Maintains global state information

### Intro

Dynamic Global Properties represents a set of values that are calculated during normal chain operations and reflect the current values of global blockchain properties.

The API returns an object containing information that changes every block interval such as the head block number, the total vesting fund, etc.

### Sections

- Fields

- `confidential_sbd_supply`
- `confidential_supply`
- `current_aslot`
- `current_sbd_supply`
- `current_supply`
- `current_witness`
- `downvote_pool_percent`
- `head_block_id`
- `head_block_number`
- `last_budget_time`
- `last_irreversible_block_num`
- `maximum_block_size`
- `next_maintenance_time`
- `num_pow_witnesses`
- `participation_count`
- `recent_slots_filled`
- `required_actions_partition_percent`
- `reverse_auction_seconds`
- `sbd_interest_rate`
- `sbd_start_percent`
- `sbd_stop_percent`
- `target_votes_per_period`
- `time`
- `total_pow`
- `total_reward_fund_steem`
- `total_reward_shares2`
- `total_vesting_fund_steem`
- `total_vesting_shares`
- `virtual_supply`
- `vote_power_reserve_rate`
- `average_block_size`
- `current_reserve_ratio`
- `max_virtual_bandwidth`

- Not Covered
- Example Method Call
- Example Output

### `average_block_size`

- Removed
- Related

Removed in 0.20.6, see: #3029

Average block size is updated every block to be: `average_block_size = (99 * average_block_size + new_block_size) / 100`. This property is used to update the `current_reserve_ratio` to maintain approximately * 50% or less utilization of network capacity.

- Examples:

  - `9309`

### `confidential_sbd_supply`

- Related

Total asset held in confidential balances.

- Examples:

  - `0.000 HBD`

### `confidential_supply`

- Related

Total asset held in confidential balances.

- Examples:

  - `0.000 HIVE`

### `current_aslot`

- Related

The current absolute slot number. Equal to the total number of slots since genesis. Also equal to the total number of missed slots plus `head_block_number`.

- Examples:

  - `24231997`

### `current_reserve_ratio`

- Removed
- Related

Removed in 0.20.6, see: #3029

Any time `average_block_size <= 50% maximum_block_size` this value grows by 1 until it reaches `HIVE_MAX_RESERVE_RATIO`. Any time `average_block_size` is greater than 50% it falls by 1%. Upward adjustments happen once per round, downward adjustments happen every block.

- Examples:

  - `200000000`

### `current_sbd_supply`

- Related

HBD currently in existence.

- Examples:

  - `15478883.968 HBD`

### `current_supply`

- Related

HIVE currently in existence.

- Examples:

  - `271546371.129 HIVE`

### `current_witness`

- Related

Account name of the current witness.

- Examples:

  - `blocktrades`

### `downvote_pool_percent`

- Since: HF21
- Related

Used by a separate downvote pool that is a percentage of the max size of the voting mana. Downvotes will be taken from the downvote pool first, and then the upvote pool once the downvote pool has been consumed. The downvote pool will follow the same rules as the upvote pool, regenerating over five days and filling instantly and proportionally to new Hive Power and delegations.

- Examples:

  - `2500`

See: #3336, #3344

### `head_block_id`

- Related

Used to implement TaPoS (Transaction as Proof of Stake). The first 4 bytes (8 hex digits) of the block ID represents the block number. E.g., `01709398` in hex is `24155032` in decimal.

- Examples:

  - `0170939865fa4e3aa7fca8f8df35d23333fe0bee`

See: RIPEMD-160 hashes

### `head_block_number`

- Related

Block height at the head of the blockchain. This represents the latest block produced by witnesses.

- Examples:

  - `24155032`

### `last_budget_time`

- Since: HF21
- Related

Used to compute payments for every proposal.

- Examples:

  - `2019-11-14T20:26:57`

See: blocktradesdevs/steem#7, `sps_fund`

### `last_irreversible_block_num`

- Related

The latest block number that has been confirmed by two thirds of all block producers and is thus irreversible.

- Examples:

  - `24155017`

### `max_virtual_bandwidth`

- Removed
- Related

Removed in 0.20.6, see: #3029

The maximum bandwidth the blockchain can support is `max_bandwidth = maximum_block_size * HIVE_BANDWIDTH_AVERAGE_WINDOW_SECONDS / HIVE_BLOCK_INTERVAL`; The maximum virtual bandwidth is: `max_bandwidth * current_reserve_ratio`

- Examples:

  - `264241152000000000000`

### `maximum_block_size`

- Related

Maximum block size is decided by the set of active witnesses which change every round. Each witness posts what they think the maximum size should be as part of their witness properties, the median size is chosen to be the maximum block size for the round.

Note: the minimum value for `maximum_block_size` is defined by the protocol to prevent the network from getting stuck by witnesses attempting to set this too low.

- Examples:

  - `65536`

### `next_maintenance_time`

- Since: HF21
- Related

Used to compute payments for every proposal.

- Examples:

  - `2019-11-14T21:26:57`

See: blocktradesdevs/steem#7, `sps_fund`

### `num_pow_witnesses`

- Deprecated
- Related

The current count of how many pending POW witnesses there are, determines the difficulty of doing pow.

- Examples:

  - `172`

See: #770

### `participation_count`

- Since: HF9
- Related

Used to compute witness participation.

- Examples:

  - `128`

### `recent_slots_filled`

- Related

Used to compute witness participation.

- Examples:

  - `340282366920938463463374607431768211455`

### `required_actions_partition_percent`

- Since: HF21
- Related

The size of the block that is partitioned for actions. Required actions can only be delayed if they take up more than this amount. More can be included, but are not required. Block generation should only include transactions up to `maximum_block_size - required_actions_parition_size` to ensure required actions are not delayed when they should not be.

- Examples:

  - `0`

### `reverse_auction_seconds`

- Since: HF21
- Related

Curation reverse auction duration.

- Examples:

  - `300`

See: #1874

### `sbd_interest_rate`

- Related

This property defines the interest rate that HBD deposits receive.

- Examples:

  - `0`

### `sbd_start_percent`

- Since: HF20
- Related

Start reducing printing of HBD at n% marketcap.

- Examples:

  - `900`

See: #2140

### `sbd_stop_percent`

- Since: HF20
- Related

Stop printing HBD at n% marketcap.

- Examples:

  - `1000`

See: #2140

### `target_votes_per_period`

- Since: Mysterious Future
- Related

The number of votes regenerated per day (over HIVE_VOTING_MANA_REGENERATION_SECONDS). Any user voting slower than this rate will be “wasting” voting power through spillover; any user voting faster than this rate will have their votes reduced.

- Examples:

  - `50`

See: #1252, #1411

### `time`

- Related

Point in time (UTC) that the block was included in the chain.

Used to synchronize events like Hard Fork activation.

When attempting to calculate the validity of a transaction we need to lookup a past block and check its block hash and the time it occurred so we can calculate whether the current transaction is valid and at what time it should expire.

For new transactions, expirations originate from this time.

- Examples:

  - `2018-07-14T01:19:51`

### `total_pow`

- Deprecated
- Related

The total POW accumulated, aka the sum of `num_pow_witness` at the time new POW is added.

- Examples:

  - `514415`

See: #770

### `total_reward_fund_steem`

- Related

HIVE available in the reward pool.

- Examples:

  - `0.000 HIVE`

### `total_reward_shares2`

- Deprecated
- Related

Now deprecated way to get the number of shares in the pool.

Use `condenser_api.get_reward_fund` instead.

- Examples:

  - `0`

### `total_vesting_fund_steem`

- Deprecated
- Related

Now deprecated way to get HIVE that is invested in HIVE POWER (powered up).

Use `condenser_api.get_reward_fund` instead.

- Examples:

  - `192713261.007 HIVE`

### `total_vesting_shares`

- Related

VESTS that are invested in HIVE POWER (powered up).

- Examples:

  - `390950506702.452773 VESTS`

### `virtual_supply`

- Related

The virtual supply is the supply of all HIVE + all HBD if all HBD were converted to HIVE at the current median price.

- Examples:

  - `283290592.652 HIVE`

### `vote_power_reserve_rate`

- Related

The number of votes regenerated per day. Any user voting slower than this rate will be “wasting” voting power through spillover; any user voting faster than this rate will have their votes reduced.

- Examples:

  - `10`

See: #1252, #1411

### `Not Covered`

Fields not covered in this recipe are:

- `available_account_subsidies`
- `content_reward_percent`
- `delegation_return_period`
- `init_sbd_supply`
- `pending_rewarded_vesting_shares`
- `pending_rewarded_vesting_steem`
- `sbd_print_rate`
- `sps_fund_percent`
- `sps_interval_ledger`
- `vesting_reward_percent`

### Example Method Call

To retrieve the current results for `condenser_api.get_dynamic_global_properties`, we can retrieve the current state information using `curl`:

    curl -s --data '{"jsonrpc":"2.0", "method":"condenser_api.get_dynamic_global_properties", "params":[], "id":1}' https://api.steemit.com

### Example Output

    {
       "id":1,
       "jsonrpc":"2.0",
       "result":{
          "head_block_number":24238248,
          "head_block_id":"0171d8a833dc369abd034b0c67d8725f96df9e5b",
          "time":"2018-07-16T22:41:24",
          "current_witness":"xeldal",
          "total_pow":514415,
          "num_pow_witnesses":172,
          "virtual_supply":"283434761.199 STEEM",
          "current_supply":"271729171.190 STEEM",
          "confidential_supply":"0.000 STEEM",
          "current_sbd_supply":"15498201.173 SBD",
          "confidential_sbd_supply":"0.000 SBD",
          "total_vesting_fund_steem":"192913644.627 STEEM",
          "total_vesting_shares":"391296886352.617261 VESTS",
          "total_reward_fund_steem":"0.000 STEEM",
          "init_sbd_supply":"7000000.000 TBD",
          "total_reward_shares2":"0",
          "pending_rewarded_vesting_shares":"379159224.860656 VESTS",
          "pending_rewarded_vesting_steem":"185294.019 STEEM",
          "sbd_interest_rate":0,
          "sbd_print_rate":2933,
          "maximum_block_size":65536,
          "current_aslot":24315228,
          "recent_slots_filled":"340282366920938463463374607431768211400",
          "participation_count":128,
          "last_irreversible_block_num":24238230,
          "vote_power_reserve_rate":10
          "required_actions_partition_percent":2500,
          "target_votes_per_period":50,
          "vote_power_reserve_rate":50,
          "delegation_return_period":432000,
          "reverse_auction_seconds":300,
          "available_account_subsidies":137414104,
          "sbd_stop_percent":1000,
          "sbd_start_percent":900,
          "next_maintenance_time":"2019-11-15T01:44:39",
          "last_budget_time":"2019-11-15T00:44:39",
          "content_reward_percent":6500,
          "vesting_reward_percent":1500,
          "sps_fund_percent":1000,
          "sps_interval_ledger":"15.162 TBD",
          "downvote_pool_percent":2500
       }
    }