{
  "manageEntity": {
    "action": "Save",
    "entityId": "1554702561",
    "entityType": "Track",
    "nonce": "0xaae57db733fcc8c95fedd6721fe22f7eb0a3f6b8d272a6634a4f9a459bc9ad2f",
    "signature": "0x243fe03938ebd1dfba6f024f5fcac82940131889fa56dfa38737d9fbae2e4dde7ed147590a1639a3fd6634dd51edea7d6c1a8644687722ff21d53d323d0246dd1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}