{
  "manageEntity": {
    "action": "Save",
    "entityId": "558773",
    "entityType": "Track",
    "nonce": "0xaaa77f8ae85cac6bffa7a2cfd9f0e0f9f54fcf57614a00da31c0b116ec04075d",
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    "signer": "0xDD3Cb841c7f19ec5581F8E2b14d6f7a58B92d0F7",
    "userId": "582464754"
  }
}