{
  "manageEntity": {
    "action": "Save",
    "entityId": "288369",
    "entityType": "Track",
    "nonce": "0x648db72b0a108faf5aaf2845cbcf7dea56dcc6f43ee1d6dae191357814160331",
    "signature": "0xb447850ed0745f47409bd0cc0e7a89da544871fe03ce8eef08328f54cb2e0bc573e37475346b6ab6c50c661e2f804846e9fdc805f0f502a5040a488659fb0f671c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}