{
  "manageEntity": {
    "action": "Save",
    "entityId": "38415",
    "entityType": "Track",
    "nonce": "0x0099af7d65b6e3230c67fca04fe13c3506b27b4a7a0bf6a021161a9e1dc4f741",
    "signature": "0x510e3b604ff99008ea3c1d9aa12bd9c3fed704c932bd13a30f6bdbb02fc7b7a91ee9c0588da324a342eb623a29b195ebfc5df5559316610857e0313515b2de261b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}