{
  "manageEntity": {
    "action": "Save",
    "entityId": "137422",
    "entityType": "Track",
    "nonce": "0x2b59f34967e0f2c96ba144ab216d4d1cb35b94a64caab79d0bc362328a69a09b",
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    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}