{
  "manageEntity": {
    "action": "Save",
    "entityId": "1873118254",
    "entityType": "Track",
    "nonce": "0x1b9cf6f46a5eabf59f184dd144b9d594359ec8f523a4ec3628b5a0f522447022",
    "signature": "0x766f81fdc51ff40768c0eb3f57e251dcd10dbadf28522fcfade091c6f2fcdb426b0f438f135adca4a23f1218811fc9b24ffc49335f4cce063227771f926e6d891c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}