{
  "manageEntity": {
    "action": "Save",
    "entityId": "1230530018",
    "entityType": "Track",
    "nonce": "0x3bbfcf7f37b172ea83b4c6f6f14fb9c3daef69bde32fbba4bcf32a9d6598d150",
    "signature": "0x54276a683a1b35f32703bdd499b13ea1a4301ecd11db124dd7d593ff927002bf014312339ec00c6fc656c318ab2a8b8220abe4af25c077de50beb754ab54303f1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}