{
  "manageEntity": {
    "action": "Save",
    "entityId": "1518260724",
    "entityType": "Track",
    "nonce": "1793019119529528532",
    "signature": "0x642a6f21fd7fb5b8ff6964ff1e6d731c04b299458498ccc5753c82c2787632377938a64dea5738a2e074deea825208d2b2f9a21f6ff2cc6f94da378f82507b0b1b",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}