{
  "manageEntity": {
    "action": "Save",
    "entityId": "1819195129",
    "entityType": "Track",
    "nonce": "1787409308751677722",
    "signature": "0x2acfec4cefa43d511ed25b321cf63c44ffe74aba260659fb10cb04842934e0a64b67fb7288ecceab1d1550c7a2f34ad316073fa22b542073c9ba7fd37e5cc3e91c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}