{
  "manageEntity": {
    "action": "Save",
    "entityId": "610368043",
    "entityType": "Track",
    "nonce": "0xc5b6ad974ddf7a1ef44c73f0702e68653ee0efffde105915249448e4c1ce18bf",
    "signature": "0x375d78c10169998d94290460362a1687aacaf28966be7b4eb5328780ffce0e002bbd113f196d1e6951d3d088e682f8b967ee23fa4f7088568c89a84985ba48a21c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}