{
  "manageEntity": {
    "action": "Save",
    "entityId": "1889342496",
    "entityType": "Track",
    "nonce": "0x25a5801437ca7d7a08d1c6265e0b3851167dba0f45614e8b452e205b25d284d2",
    "signature": "0xf63af2a628872550e72f4ad453af60301a0830d44248b1f0001d58b9451784e812a8819ab39f041ec15b4a1e81841edbc59a6388208e77a814e5373650214ea01b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}