{
  "manageEntity": {
    "action": "Save",
    "entityId": "595643812",
    "entityType": "Track",
    "nonce": "0xec3592c444bf5e05b9f556b642f1a27b55e4f6d5e973bf2e1a7d9eba1e6af18c",
    "signature": "0xd242cf7838a6dc7ed7c9cec1f636fc12f87df333f5c8bc39afd9b13fd72b80e27b44ea436ea7a14cb855c94025aa5f49adc4c0112a69d9775d02831540ffce8a1b",
    "signer": "0x5D012C880480A2E1ab4345f6F374CFf73e040331",
    "userId": "10449019"
  }
}