{
  "manageEntity": {
    "action": "Save",
    "entityId": "577817855",
    "entityType": "Track",
    "nonce": "1786995603893115426",
    "signature": "0xcce90d58a0e5eccf2e85117ed9e77069a8340f225d700c204dbe2db86d7acd76195d2db5d5e7e26d579c1fb0e8965b83d99e230aaaa242f952de8aa776c98ea81c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}