{
  "manageEntity": {
    "action": "Save",
    "entityId": "544308",
    "entityType": "Track",
    "nonce": "0x9fa04118ff3924de863c06c04c156067f33d12b9852d5fb9c536cbe7f5cd9815",
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    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}