{
  "manageEntity": {
    "action": "Save",
    "entityId": "708802",
    "entityType": "Track",
    "nonce": "0x99b00b71042a890a34492f3a4b6eec12f87a80a44dfa1fce86522d0edd07f872",
    "signature": "0xb5d2ffd9ae2871c9662c0fdabdd49b9bb8cd1cdb287950ccfc66f5094fc19b650fb88e393d01944c254250fd9b58cb0a4d77374d7f9b27ac8adaaef3922e30521b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}