{
  "manageEntity": {
    "action": "Save",
    "entityId": "308992824",
    "entityType": "Track",
    "nonce": "0xccd7a573a5a107ea0a901378d23c11e773148a757eaf75dce23c4a416dc2a8e2",
    "signature": "0xa4e00e66705d620e4079f175888feb5337de600f338a2e45cb857f0a10de3a20329eaa26654bfbca3ad61e1921a3c85ab18efcc8e3fc1d005639ad192e4040ab1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}