{
  "manageEntity": {
    "action": "Save",
    "entityId": "80877",
    "entityType": "Track",
    "nonce": "0x150f7f697c0e36611023e79833ec080c77aa188875e6c76f4c5c866252cab0a8",
    "signature": "0xd401a5b1231d07449fc887e32ac02242175fad5582c46e68cd6757a5f197f14e3b6b1eb81bc48490abcdcb0b3ea8a69e6b01a43f51691f1f7dbee8175e9857c21b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}