{
  "manageEntity": {
    "action": "Save",
    "entityId": "677423125",
    "entityType": "Track",
    "nonce": "0x553d7e35246de39c9835eb917350f3b091b0f388aeaed73319f1949bb9189756",
    "signature": "0x619a5f530680d6913913bf9d48924df16c3daba34bb34ddb77410c3c86dfa3274a1423467b7473104cd8394dc70a53831d4eccc2df4061d22594fe92ca0188fe1c",
    "signer": "0xC56E1ccbA93c1E645e5F27Bf8A5ca13eB7A5eEbe",
    "userId": "335878078"
  }
}