{
  "manageEntity": {
    "action": "Save",
    "entityId": "480252",
    "entityType": "Track",
    "nonce": "0x0fb71b23dea811c3b40bc667b0bd98111c3dacdc66f629efabf11839d5f3e581",
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    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}