{
  "manageEntity": {
    "action": "Save",
    "entityId": "1508942347",
    "entityType": "Track",
    "nonce": "0x367ab45ef5877a13ad900235401e74fd0a176ea9e76bda01850cc0ffca3408b2",
    "signature": "0xe7039039d12da5de968431f21b6e364c6ae4da2cf333344adae7a49b55d22ff46da517464d79b47d88c0fb0de73bfe72e2613201c34091c996673746d28b9c441b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}