{
  "manageEntity": {
    "action": "Save",
    "entityId": "251563",
    "entityType": "Track",
    "nonce": "0x1621fde1f70594c928864781d1964c5600dae338c78684dd602a069cd704fdcc",
    "signature": "0xd00132c022ff4a900afc108b5ba3cdd4f61eb19206cd2099346e5a78aa1f030923bdaa51cc9153adedce5ada7aa64606f8d1a41ff431c15b663561b6d7d68d331b",
    "signer": "0xA3B40AD9bEaDeb7a11B85d9088BaC12a3F2Eca1f",
    "userId": "199809170"
  }
}