{
  "manageEntity": {
    "action": "Save",
    "entityId": "470190029",
    "entityType": "Track",
    "nonce": "1787507728866868003",
    "signature": "0x3773fcabc2da56f600094ea800537d803db5caa822a6a97abf7a29f75905df6b2e29482837ddda0b8de72ba78edc2eb2a9ff4333ddcd381500da7b933bf5374c1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}