{
  "manageEntity": {
    "action": "Save",
    "entityId": "1837383609",
    "entityType": "Track",
    "nonce": "0x821a72f4db211b85ab5c9838625e249ed12124e517d9d5bbcc600dd2b78a9292",
    "signature": "0x8bf9a32fabdf775d440f54f346a2daa7b0be9373dfdbd01afd966293bd5bed9623350a5c84374a7fdc0ede21cfc71386036d20cbb5c3841594e0adf61cb1d2071c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}