fetchSignerSetLastItem

Reads the last signer-manager in a reward cycle's signer set. Wraps the pox-5 read-only get-signer-set-last-item-for-cycle, which reads the signer-set-ll-last-for-cycle map.

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Usage

import { fetchPoxInfo, fetchSignerSetLastItem, fetchSignerSetPrevItem } from '@stacks/bitcoin-staking';

const { rewardCycleId: rewardCycle } = await fetchPoxInfo({ network: 'mainnet' });

// Newest first
const signers: string[] = [];
let signer = await fetchSignerSetLastItem({ rewardCycle, network: 'mainnet' });
while (signer) {
  signers.push(signer);
  signer = await fetchSignerSetPrevItem({ signer, rewardCycle, network: 'mainnet' });
}

Notes

• pox-5 stores each reward cycle's signer set as a doubly linked list of signer-manager principals (signer-set maps). A signer-manager is appended at the tail when the total STX staked to it for the cycle reaches 50,000 STX (SIGNER_SET_MIN_USTX, 50,000,000,000 micro-STX) and is unlinked when that total falls below (SIGNER_SET_MIN_USTX, add-staker-to-signer-for-cycle, remove-staker-from-signer-for-cycle).

• Resolves to undefined when the cycle's signer set is empty (get-signer-set-last-item-for-cycle).

• A non-2xx response throws an Error whose message starts with Error calling read-only function. and includes the status code and URL. If the node reports that the call failed, the Error message is the node's cause.

Reference Link

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Signature

function fetchSignerSetLastItem(
  opts: { rewardCycle: number } & NetworkClientParam
): Promise<string | undefined>;

opts is a NetworkClientParam plus rewardCycle.

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Returns

Promise<string | undefined>

Resolves to the contract principal of the last signer-manager, or undefined.

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Parameters

opts.rewardCycle (required)

• Type: number

Reward cycle to read.

opts.network (optional)

• Type: StacksNetworkName | StacksNetwork

The network to query: a name such as 'mainnet' or 'testnet', or a StacksNetwork object. Defaults to 'mainnet'.

opts.client (optional)

• Type: { baseUrl?: string; fetch?: FetchFn }

Overrides the API base URL or the fetch function, for example to query your own node. Fields you set replace the network's defaults.