{
  "manageEntity": {
    "action": "Save",
    "entityId": "678689816",
    "entityType": "Track",
    "nonce": "0xb1f9898344cf197d68309f26cdc5de808c8851ca911c0bcdc443dd2bd16b28a3",
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    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}