{
  "manageEntity": {
    "action": "Save",
    "entityId": "1553962649",
    "entityType": "Track",
    "nonce": "0xe34c1aafe979b94de9e9a62bc12faed0814adec7724795a7e185458ad1573911",
    "signature": "0xba775478de1c833cea653aaba2968e04b5c5dd1ef7aa6b38246276e134d86f2a53f7703a4bb434f7a44b2ae9084b0f3a32b51b583732ca145a1e7fbd120dfb981c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}