{
  "manageEntity": {
    "action": "Save",
    "entityId": "452332",
    "entityType": "Track",
    "nonce": "0xfe93a726163cc2ae58b0a06b583ea649dabcc927ef3e91b8c5108ed1d61de7b8",
    "signature": "0x66ee35f06ce7fb74460e5f33aacad211fdc45b7642f252de97bc910bf622bf6e1533e42fd6276cd2c78c39c18db0488b04e067179d6ee55f2d99427f56197c551c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}