{
  "manageEntity": {
    "action": "Save",
    "entityId": "576556781",
    "entityType": "Track",
    "nonce": "1786151484202561757",
    "signature": "0x4f1b33ee662c4337fad3fb38a4e1dde1d4c38e0da8dd4471b73f62569f8fa72c1637da31122b4efd4599d901370270af38b3a7c1fe22138e4b2fdef4e7d89dfa1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}