{
  "manageEntity": {
    "action": "Save",
    "entityId": "1138174228",
    "entityType": "Track",
    "nonce": "0x5efc46b0601db6279eb632fa9473ba88159afd7f89fea983f9bf0e15ac238b42",
    "signature": "0xe36be7babae84391e5748433597b1afabd854f4b357e63684b3133995558b4300f0cfc941cb373a5aad5e53415ad9511ee4257d75e59e1a5a585318e5abc92371b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}