{
  "manageEntity": {
    "action": "Save",
    "entityId": "1575127956",
    "entityType": "Track",
    "nonce": "0xda3391bafb3ed797c590c5cfe23092240a16a2574cde9beb54d4b33e9e016d86",
    "signature": "0xd45a1bfd9095479acd7f6b492a0168ff345826bde09fa72749661a5ca011e0f93bd0b36021e1b41972dd32f901d873cee25cdf75ccdf89bb50e3a73be92056551b",
    "signer": "0xb51B50C9b7d88C66d31539161F4BA9Dd72a17dF5",
    "userId": "465531556"
  }
}