{
  "manageEntity": {
    "action": "Save",
    "entityId": "221862",
    "entityType": "Track",
    "nonce": "0x804fb06dc311dfc28f08f7d02e7cc0b9ccf77061e49032876b2ef6a848c263d1",
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    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}