{
  "manageEntity": {
    "action": "Save",
    "entityId": "1987702442",
    "entityType": "Track",
    "nonce": "0x5b38e2a86ecba190babbcd4ac0afcd932e8328765ad0caf291a2788504218333",
    "signature": "0x3e20cc5111480a0cfb89f08c3188dac81ebc6ffff765118ad6a4f147f234c15b78e1a65347d169c4f3066b7425aff87c0dc770b2f31e66057d0612e5e430d9ed1b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}