{
  "manageEntity": {
    "action": "Save",
    "entityId": "689047458",
    "entityType": "Track",
    "nonce": "0x58b7e600874b885d00a0d1076a86a43b63136a879baa4ffc031da4ec12f31839",
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    "signer": "0x7eBAab495a64FAea1f04dc59ff804bf939da7B12",
    "userId": "709077025"
  }
}