{
  "manageEntity": {
    "action": "Save",
    "entityId": "1551327568",
    "entityType": "Track",
    "nonce": "0x877e4ab0a1b23837461bb85e1e4d8a7548e59de0f3b16bb54717c2c500dd2d47",
    "signature": "0xdde5ad7938924b757ec850e4274aa6eb3cfbc7b62fa770672b95d210059c55fc33a952076346b4dc8d719b2e4e561df08366089f84499a1574e2fd019f0928ad1b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}