{
  "manageEntity": {
    "action": "Save",
    "entityId": "1901042764",
    "entityType": "Track",
    "nonce": "0xc85cd596ab6ae8b31daebba1b54e818bc512d26cec3f0e23fd84d92d13314d90",
    "signature": "0xbca1ac48c6282ce98737913711a2f5bd5357b0364809d8998cd4d95f76cd830b3b71bc218306c38da8d6f8ad255a1f3dbd0dedc405e36b174bcfd64a19fd765e1c",
    "signer": "0xc169f001bb496e75587Ea184Cd1f88D2EeE174ca",
    "userId": "359407869"
  }
}