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In Naruto, I have seen that to create summoning contract and to use summoning jutsu, the user uses their own blood.

Why is this required? What is the significance of using blood here?

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You can read in the Wikia that

The Summoning Technique is a space–time ninjutsu that allows the summoner to transport animals or people across long distances instantly and uses blood as a sacrifice.

In more detail:

  • The contract comes in the form of a scroll, on which the contractor uses their own blood to sign their name and place their fingerprints and once signed it is valid even after the contractors death as long as the contract itself remains intact. After this, they need only offer an additional donation of blood on the hand they signed the contract with, mould their chakra with hand seals and then plant the hand they signed the contract with at the location they wish to summon the creature.

  • It should be noted that anyone can summon a contracted animal as long as they have the blood of someone who has made a contract, the seal of the summoned creature and a source of sufficient chakra that the summon will accept.

So basically, the blood serves as a means of identifying the summoner for the summoned and also acts as a price (sacrifice) for calling them.

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  1. It will recognize the contractor/summoner through moulding their chakra with hand seals, and with their own blood that they signed the contract with.
  2. The contract insures an everlasting validity for summoning the creature.

Some of the information contained in this post requires additional references. Please edit to add citations to reliable sources that support the assertions made here. Unsourced material may be disputed or deleted.

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