{
  "manageEntity": {
    "action": "Save",
    "entityId": "821816393",
    "entityType": "Track",
    "nonce": "1792404858315113158",
    "signature": "0xae92d37c1b8d89fac29df57b964ded3ec3eb2c3d006edadaf8fb6d2a225fd2fd2fe27728dfed56a942fbf139396c3a14793df5feed5bf2af1e844b5fe4bf510e1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}