{
  "manageEntity": {
    "action": "Save",
    "entityId": "1578980763",
    "entityType": "Track",
    "nonce": "1788292030977084268",
    "signature": "0x07c8f552d7cf217fa503206851d49934e4c267fed6e48f6fcc3ad54cbc9597046286b5f2d9a3451089bfc824ffa7d2e52c03ad316981ca09e9a5909c007fe6b51c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}