{
  "manageEntity": {
    "action": "Save",
    "entityId": "1553729866",
    "entityType": "Track",
    "nonce": "0xc4e552b157888346f46e1e93037988a89e9be7ea526d6385c1d8f7123da8c1ae",
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    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}