{
  "manageEntity": {
    "action": "Save",
    "entityId": "321780949",
    "entityType": "Track",
    "nonce": "0x444fe477d973ad25c9c56a25ba66dde5860bcf396ce37279b386a76bc8371302",
    "signature": "0x47c3ccbbd1eb526dbac1a35277530534d37d3b57a445f1fdbbd246042393affb78ab2858bd3c7bb8c393b3f29a7003b42ec5990fb12c57370b364baa95c82e141b",
    "signer": "0x738Fb353b57EdB4d1f33c0049D33b204243db2ad",
    "userId": "693463302"
  }
}