XChainModifyBridge

Attention

Cross-chain bridges functionality is part of the proposed XLS-38d extension (Not Enabled) to the XRP Ledger protocol. There isn't an official amendment yet. Until there is an amendment, the details documented on these pages are subject to change frequently. [Source]

Please use this form to report bugs, provide feedback, or share network issues you experience.

[Source]

The XChainModifyBridge transaction allows bridge managers to modify the parameters of the bridge. They can only change the SignatureReward and the MinAccountCreateAmount.

This transaction must be sent by the door account and requires the entities that control the witness servers to coordinate and provide the signatures for this transaction. This coordination happens outside the ledger.

Note: You can't modify the signer list for the bridge with this transaction. The signer list is on the door account itself and is changed in the same way signer lists are changed on accounts (via a SignerListSet transaction).

Example XChainModifyBridge JSON

{
  "TransactionType": "XChainModifyBridge",
  "Account": "rhWQzvdmhf5vFS35vtKUSUwNZHGT53qQsg",
  "XChainBridge": {
    "LockingChainDoor": "rhWQzvdmhf5vFS35vtKUSUwNZHGT53qQsg",
    "LockingChainIssue": {
      "currency": "XRP"
    },
    "IssuingChainDoor": "rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh",
    "IssuingChainIssue": {
      "currency": "XRP"
    }
  },
  "SignatureReward": 200,
  "MinAccountCreateAmount": 1000000
}

XChainModifyBridge Fields

Field	JSON Type	Internal Type	Required?	Description
`Flags`	`number`	`UINT32`	Yes	Specifies the flags for this transaction.
`MinAccountCreateAmount`	`Currency Amount`	`AMOUNT`	No	The minimum amount, in XRP, required for a `XChainAccountCreateCommit` transaction. If this is not present, the `XChainAccountCreateCommit` transaction will fail. This field can only be present on XRP-XRP bridges.
`SignatureReward`	`Currency Amount`	`AMOUNT`	No	The signature reward split between the witnesses for submitting attestations.
`XChainBridge`	`XChainBridge`	`XCHAIN_BRIDGE`	Yes	The bridge to modify.

XChainBridge Fields

Field	JSON Type	Internal Type	Required?	Description
`IssuingChainDoor`	`string`	`ACCOUNT`	Yes	The door account on the issuing chain. For an XRP-XRP bridge, this must be the genesis account (the account that is created when the network is first started, which contains all of the XRP).
`IssuingChainIssue`	`Issue`	`ISSUE`	Yes	The asset that is minted and burned on the issuing chain. For an IOU-IOU bridge, the issuer of the asset must be the door account on the issuing chain, to avoid supply issues.
`LockingChainDoor`	`string`	`ACCOUNT`	Yes	The door account on the locking chain.
`LockingChainIssue`	`Issue`	`ISSUE`	Yes	The asset that is locked and unlocked on the locking chain.

XCHAIN_BRIDGE Field Type

XCHAIN_BRIDGE is a new field type introduced by XLS-38d.

Type Name	Type Code	Bit Length	Length-prefixed?	Description
`XCHAIN_BRIDGE`	25	Variable	No	A bridge between two blockchains, identified by the door accounts and issued assets on the locking chain and issuing chain. `XCHAIN_BRIDGE` is serialized in this order: locking chain door, locking chain issue, issuing chain door, issuing chain issue.

Transaction Flags

In addition to the universal transaction flags that are applicable to all transactions, you can specify this flag:

Flag Name	Flag Value	Description
`tfClearAccountCreateAmount`	`0x00010000`	Clears the `MinAccountCreateAmount` of the bridge.