{
  "manageEntity": {
    "action": "Save",
    "entityId": "9902445",
    "entityType": "Track",
    "nonce": "1792449384297397866",
    "signature": "0x10fa2b9b38f27cfeaa40050d255fc56bdee7965c0022f3f9b3f05759d137ae0b74d927d5aeaf42c3d8d5f3aa70e68a3fe66ba6536c9310ff10bf7fda2f8f654c1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}