{
  "manageEntity": {
    "action": "Save",
    "entityId": "818812935",
    "entityType": "Track",
    "nonce": "0xa3f90c67d5d82ae7334220f1c2d14783fd54c141e05039ab33d9e0ecf6ab74c9",
    "signature": "0xf9cca0c9ca7be90401b965e4a4b080a4ae70e037dd526ba814740fdb35b9e28b26c5f2aff70a38e73142c824fa5823b9656746c86d8f70c2d7b55de7bf3f18001b",
    "signer": "0x48c57b64a5a12Dc7C7742Fdb629EEce52FF5591D",
    "userId": "930634116"
  }
}