{
  "manageEntity": {
    "action": "Save",
    "entityId": "999684642",
    "entityType": "Track",
    "nonce": "0x11473fd1d2f4bc2ef3b0c218a857afec335c8c7553963f9ffe10d2b52d15286f",
    "signature": "0xfa9b9455c7cc71a1ee239ca9cf1388c000aa84de6481e090a6992a5b07c27ce127a7e51c9e34bdbbe4211f1e3fb7c835da7cb9261427a70c049d5580d7c7266e1b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}