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type BlockTag: BigNumberish | string;
A BlockTag specifies a specific block. numeric value - specifies the block height, where the genesis block is block 0; many operations accept a negative value which indicates the block number should be deducted from the most recent block. A numeric value may be a number, bigint, or a decimal of hex string. blockhash - specifies a specific block by its blockhash; this allows potentially orphaned blocks to be specifed, without ambiguity, but many backends do not support this for some operations.

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Source

providers/provider.ts:43