Short transaction identifier collision detection and reconciliation
Methods and devices for resolving a collision in short transaction identifiers in a blockchain network. The method may include receiving a set of short transaction identifiers from a sending node. The receiving node locates a corresponding full transaction identifier for each short transaction identifier in a mempool. For at least one short transaction identifier, the receiver identifies a collision. It then sends a message to the sending node requesting resolution of the collision regarding the at least one short transaction identifier, and receives collision resolution data from the sending node to enable identification of a valid corresponding full transaction identifier for the at least one short transaction identifier. The receiver may send intermediate Merkle tree hashes with its request for resolution, and the collision resolution data may include information identifying which of the hashes is incorrect.
1. A computer-implemented method of resolving short transaction identifier collision in a blockchain network, comprising:
receiving block data from a sending node, including a block Merkle root and a set of short transaction identifiers from a sending node;
for each short transaction identifier, locating a corresponding full transaction identifier in a mempool;
calculating a Merkle tree based on the full transaction identifiers, the Merkle tree having a Merkle root;
determining that the calculated Merkle root does not match the block Merkle root;
sending, to the sending node, Merkle tree hashes from an intermediate layer of the Merkle tree;
receiving, from the sending node, resolution data identifying which of the Merkle tree hashes is incorrect; and
repeating the sending of Merkle tree hashes and receiving of resolution data until a collision is resolved.
2. The method of claim 1 , wherein each short transaction identifier is a truncation of its corresponding full transaction identifier.
3. The method of claim 1 , wherein the resolution data includes a flag for each of the Merkle tree hashes for the intermediate layer indicating whether that Merkle tree hash is valid.
4. The method of claim 1 , wherein the resolution data includes full transaction identifiers for a portion of a bottom layer of the Merkle tree.
5. The method of claim 1 , wherein the intermediate layer is a layer of the Merkle tree between an identified unmatched Merkle hash and a bottom layer of the Merkle tree.
6. The method of claim 5 , further comprising selecting the intermediate layer.
7. The method of claim 1 , wherein the Merkle tree hashes include partial Merkle tree hashes.
8. The method of claim 1 , wherein receiving block data includes receiving, from the sending node, a pre-emptive set of Merkle tree hashes from a selected layer of the Merkle tree.
9. A computing device to resolve short transaction identifier collision in a blockchain network, the computing device including:
one or more processors;
memory; and
computer-executable instructions stored in the memory that, when executed by the one or more processors, cause the processors to perform the steps of:
receiving block data from a sending node, including a block Merkle root and a set of short transaction identifiers from a sending node;
for each short transaction identifier, locating a corresponding full transaction identifier in a mempool;
calculating a Merkle tree based on the full transaction identifiers, the Merkle tree having a Merkle root;
determining that the calculated Merkle root does not match the block Merkle root;
sending, to the sending node, Merkle tree hashes from an intermediate layer of the Merkle tree;
receiving, from the sending node, resolution data identifying which of the Merkle tree hashes is incorrect; and
repeating the sending of Merkle tree hashes and receiving of resolution data until a collision is resolved.
10. The computing device of claim 9 , wherein each short transaction identifier is a truncation of its corresponding full transaction identifier.
11. The computing device of claim 9 , wherein the resolution data includes a flag for each of the Merkle tree hashes for the intermediate layer indicating whether that Merkle tree hash is valid.
12. The computing device of claim 9 , wherein the resolution data includes full transaction identifiers for a portion of a bottom layer of the Merkle tree.
13. The computing device of claim 9 , wherein the intermediate layer is a layer of the Merkle tree between an identified unmatched Merkle hash and a bottom layer of the Merkle tree.
14. The computing device of claim 9 , wherein the computer-executable instructions include instructions that, when executed by one or more processors, cause the processors to perform the step of selecting the intermediate layer.