{
  "manageEntity": {
    "action": "Save",
    "entityId": "251045972",
    "entityType": "Track",
    "nonce": "1787751541235695463",
    "signature": "0xc412dc6677bc799fff1bb5bbd2cc212a471efacb516c0da53574c1516b8682193b04264e463fc1f3b10532de6234a5cd1b010c7e75b43c81dd73252561a8a8031c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}