{
  "manageEntity": {
    "action": "Save",
    "entityId": "1961747691",
    "entityType": "Track",
    "nonce": "1785359177383592479",
    "signature": "0xeb25670d7ef7463d0cb7b24ee40397d317aff49434b1ec43fb2ef38f9f96579c11c21c35056701d3d61d2bf8c1d4b38e89e22feb5e317b4a79f88557e05a3c001b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}