{
  "manageEntity": {
    "action": "Save",
    "entityId": "519653899",
    "entityType": "Track",
    "nonce": "0xc71a4a1b7659633c8a272a780e363f6f7a1f4b1e0739b0e1625985c0c7553c8b",
    "signature": "0x8a1668a5a2f956c9b86ae9ed139246b0954887ea468c3a90108f12dc1dc6467131a0c569420ef7bf2fc2480a5728a081f1562193d665b906fc4771c9853c7d3e1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}