{
  "manageEntity": {
    "action": "Save",
    "entityId": "503990386",
    "entityType": "Track",
    "nonce": "0x39acd43caae5bddf7aae16d08c0caec3822867f27082a89356fd911a5e41efc9",
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    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
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}