{
  "manageEntity": {
    "action": "Save",
    "entityId": "585621228",
    "entityType": "Track",
    "nonce": "1787258374879324817",
    "signature": "0x4290895f8d61642d898afb0a1766d0a96c4e6fe772221b047c39bfcbdaba9b503965e4d1e446997e0ce5aca9629753f7cdec188fcf5c4db348de23c423dc4b6a1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}