{
  "manageEntity": {
    "action": "Save",
    "entityId": "1013123",
    "entityType": "Track",
    "nonce": "0x0efecb905e92b1cbadd5934ac0b19b29f31ddc70fa3da40eaa8b0daf3a9eecc3",
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    "signer": "0x629256a8696F1C3BF59aD9204C3Aa4dC8bc4C07d",
    "userId": "871265631"
  }
}