{
  "manageEntity": {
    "action": "Save",
    "entityId": "303365515",
    "entityType": "Track",
    "nonce": "0x3a0ebb2e27e460bdc0c8c58e1ef8a9c06aba22cd798ca49096720451b839d54b",
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    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}