Ledger and Proof queries

Ledger API

type Ledger interface {
    // GetBlockHeader returns block header from ledger
    GetBlockHeader(blockNum uint64) (*types.BlockHeader, error)
    // GetLedgerPath returns cryptographically verifiable path between any block pairs in ledger skip list
    GetLedgerPath(startBlock, endBlock uint64) ([]*types.BlockHeader, error)
    // GetTransactionProof returns intermediate hashes from hash(tx, validating info) to root of
    // tx merkle tree stored in block header
    GetTransactionProof(blockNum uint64, txIndex int) (*TxProof, error)
    // GetTransactionReceipt return block header where tx is stored and tx index inside block
    GetTransactionReceipt(txId string) (*types.TxReceipt, error)
    // GetDataProof returns proof of existence of value associated with key in block Merkle-Patricia Trie
    // Proof itself is a path from node that contains value to root node in MPTrie
    GetDataProof(blockNum uint64, dbName, key string, isDeleted bool) (*state.Proof, error)
    // NewBlockHeaderDeliveryService creates a delivery service to deliver block header
    // from a given starting block number present in the config to all the future block
    // till the service is stopped
    NewBlockHeaderDeliveryService(conf *BlockHeaderDeliveryConfig) BlockHeaderDelivererService
}