{
  "manageEntity": {
    "action": "Save",
    "entityId": "371841",
    "entityType": "Track",
    "nonce": "0x85838e2be66f880a599052ef74c259f732835bf1cf3d201ff1fa2c0174086c01",
    "signature": "0xde6de0ee3664845b9de7868004c3e1ce3e4710ba0df7823b7750a12f8a55054940f5c0a8053d5d728388918b7409505b550dedfbc144ada38f13d410645b97111c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}