{
  "manageEntity": {
    "action": "Save",
    "entityId": "302974",
    "entityType": "Track",
    "nonce": "0x458f2c419dcb9f0050df9009666393d7634bca4fff073aeec7df9532dda67dd0",
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    "signer": "0x7eBAab495a64FAea1f04dc59ff804bf939da7B12",
    "userId": "709077025"
  }
}