{
  "manageEntity": {
    "action": "Save",
    "entityId": "587848",
    "entityType": "Track",
    "nonce": "0xd8372ee5916c5b7cc60f55d71b88ffb68b794d5adce6175fc5863433cc5350a0",
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    "signer": "0xeFC9B78A20535768B9d5BCd2702b853bd5C0789c",
    "userId": "333246"
  }
}