1. Transactions that are not well-formed (see appendix section 10.2.4 for the full anatomy of a transaction) are ignored by the recipient node; 2. Transactions that have already been processed are dropped; 3. The wallet associated with the transaction must contain a sucient token balance in order to process said transaction and any additional pending transactions from the same wallet; 4. T Xowner and T Xtarget should not refer to the same wallet; 5. The transaction cost must be above a dynamic minimum (see section 3.2.3 for further details of transaction cost and pricing); 6. The T Xanchor must be present in the current wallet list as T Xowners last processed transaction ID, the independent hash of one of the last 50 blocks, or be empty for the rst transaction; 34 4.2.2 Blocks During operation, a node will receive blocks from other peers in the data distribution network, either other miners or special-purpose peers (for example, Weaver browser nodes). The receiving node needs to valida

Prompt block propagation is part of fork avoidance a node must make sure the blocks it accepts are also accepted by its peers. Critically, in order to make preliminary block verication inexpensive prior to gossiping the block to other peers (risking increasing block consensus time and subsequently forks see section 2.3 for more details of blockshadows), the proof of work found in blockshadows is veriable independently from other block checks. This avoids the necessity for constructing blockshadows into full block structures and verifying the BDS which could otherwise become a denial of service attack vector.

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