{
  "manageEntity": {
    "action": "Save",
    "entityId": "408739388",
    "entityType": "Track",
    "nonce": "0x3fcd42064b92cfffb1f1da844bac2af8e4966fabaf351b77a7834272b40df43b",
    "signature": "0xc14a641f83ab9450a36db9e152b73879fbd62e0a19a136dbffb56211f7ca343a7cc208af29fc49d3c639ee407e24ff22000c597f6d712abcff0a806b7c96a25c1c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}