{
  "manageEntity": {
    "action": "Save",
    "entityId": "2119212222",
    "entityType": "Track",
    "nonce": "0xd4886532fa88a55227e537717a233bfe3c94f1cfcb3ecf40e00fb2e92eac8149",
    "signature": "0xee8845f9b4a2063d13a495c01af4fbd1842c4733244452123d5f06d7d2f5c86d3a02fc80fc7fa6aa0892e71a86ad79bf3e359fda16357924a45faaa8f56704bb1b",
    "signer": "0x06480A66A296C66bd7377A0959c93A5E65fC696b",
    "userId": "567768542"
  }
}