{
  "manageEntity": {
    "action": "Save",
    "entityId": "399413",
    "entityType": "Track",
    "nonce": "0x76599bde56e2791449db7580e9aeda24a82c09a29d4918b7436b103e665d64e1",
    "signature": "0xc6f145790a8869d362267cee2d716f0a19aa5cb3af2fd13818e7148585d3f65d7b16aad8136e333e9b3c1353f36e28e8b4bb96a8723e6b36b3b1b83c4811b1591c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}