{
  "manageEntity": {
    "action": "Save",
    "entityId": "449040297",
    "entityType": "Track",
    "nonce": "0xcfecbf2498108e985478a21cd9abf62ea884baf978477de193188fb55740de42",
    "signature": "0x53d366d414462da8bc091c300c3ec9d01bc1e370112b28eb51f6c2b3799f4ac910a4574b25a13a1b9d4de791c313c89d9c7b52498e73b3906a0d4a79c1baffb11c",
    "signer": "0x7B0C8223b73b88E2ff71FA991cd22e99D81fA154",
    "userId": "394678487"
  }
}