{
  "manageEntity": {
    "action": "Save",
    "entityId": "1000950",
    "entityType": "Track",
    "nonce": "0x248006a78ceb7d3b260a383e020c1e555be8826eec95c1c0e3c72f604bbb35a2",
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    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
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}