{
  "manageEntity": {
    "action": "Save",
    "entityId": "512852",
    "entityType": "Track",
    "nonce": "0xb282f12f2b297e4fca67b340647ec52b6e26a114e453dd05ab1cc51f97905c5c",
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    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}