{
  "manageEntity": {
    "action": "Save",
    "entityId": "691499",
    "entityType": "Track",
    "nonce": "0x64347f7e41010e2ac93ccb1ebe01cb3e4eb72bc378fe62bb641d665bc6dea14f",
    "signature": "0x3dfe348e49f7bae1e8c0ec377fd4c9f290add8f7a437c39229656a6c48d7b424681c7731d39f156a80300ff79f64f0ec101d02a65773b34fa786732dafc326561b",
    "signer": "0x061A60900C738C67bcf3F9Cb7Fe8f703DbEc8Ee0",
    "userId": "718327235"
  }
}