{
  "manageEntity": {
    "action": "Save",
    "entityId": "215340519",
    "entityType": "Track",
    "nonce": "0x3817dd15904ed1912d7658ea1764ad6c3c73678031e75d89b60e6be220fe75a8",
    "signature": "0xaa8ede43e8890707b0fa71a68b46d0884b8dd3a934bcede129f129c92864a2be690483dfe04816916a7a87c3ab43878b765b2a229efa53690a4e48b130c613a01c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}