{
  "manageEntity": {
    "action": "Save",
    "entityId": "338250",
    "entityType": "Track",
    "nonce": "0x3e1046c885b3aba9200763f5d38580f85b14905ea870c41c0d989de2fdc9b8ef",
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    "signer": "0xbAA633dfD19281ECC20a6b689F49CE8725d526Cc",
    "userId": "127651"
  }
}