{
  "manageEntity": {
    "action": "Save",
    "entityId": "1390172563",
    "entityType": "Track",
    "nonce": "0x58bdcfb3dc8ca698ce07e788837286988046fbfcbc775e051fa6e6ee1a3e2ecf",
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    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
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}