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  • Example JSON
  • Fields
  • Hook Fields

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  1. Technical
  2. Protocol Reference
  3. Ledger Data
  4. Ledger Objects Types

Hook

Last updated 1 year ago

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(Added by the [Hooks amendment][].)

A Hook object describes a smart contract, which can be triggered by a transaction to perform predefined operations. The operations are defined by the Hook creator and can interact with the ledger and transactions.

Example JSON

{
  "Account": "rUn84CUYbNjRoTQ6mSW7BVJPSVJNLb1QLo",
  "OwnerNode": "0000000000000000",
  "PreviousTxnID": "5463C6E08862A1FAE5EDAC12D70ADB16546A1F674930521295BC082494B62924",
  "PreviousTxnLgrSeq": 6,
  "Hooks": [
    {
      "HookHash": "46060241FABCF692D4D934BA2A6C4427CD4279083E38C77CBE642243E43BE291",
      "HookParameters": []
    }
  ],
  "LedgerEntryType": "Hook",
  "index": "49647F0D748DC3FE26BDACBC57F251AADEFFF391403EC9BF87C97F67E9977FB0"
}

Fields

A Hook object has the following fields:

Field
JSON Type
[Internal Type][]
Required?
Description

Account

String

Account

Yes

The account that created the Hook.

OwnerNode

String

UInt64

Yes

A hint indicating which page of the owner's directory links to this object, in case the directory consists of multiple pages.

PreviousTxnID

String

Hash256

Yes

The ID of the transaction that most recently modified this object.

PreviousTxnLgrSeq

Number

UInt32

Yes

The [ledger index][] of the ledger that contains the transaction that most recently modified this object.

Hooks

Array

Array

Yes

An array of hook objects. Each object has the following fields: HookHash, CreateCode, HookGrants, HookNamespace, HookParameters, HookOn, HookApiVersion, Flags.

LedgerEntryType

String

UInt16

Yes

The value 0x0043, mapped to the string Hook, indicates that this object is a Hook object.

Hook Fields

The following fields are used in the hook object:

Field
JSON Type
Internal Type
Description

HookHash

String

Hash256

The hash of the hook.

HookParameters

Array

Array

The parameters of the hook.

Flags

Number

UInt32

Additional flags for the hook.

Hook ID Format

The ID of a Hook object is the [SHA-512Half][] of the following values, concatenated in order:

  • The Hook space key (0x0048)

  • The AccountID of the sender of the [SetHook transaction][] that created the Hook object

[Source]