{
  "manageEntity": {
    "action": "Save",
    "entityId": "1645754764",
    "entityType": "Track",
    "nonce": "0x5cfce99dd9277e84541b220058b71784726587c163ef557ea008f8b4dd47f08c",
    "signature": "0x58371e68ff9ce1bdcb0c0077b0f46743c8199a5d1bdbe68007cfe048d0f668864c64fced0998fe8477ce06d86ba9028a68bcbf81d5ea761087046a21b0d8385e1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}